The complete guide to two-letter Scrabble words

Two-letter words look insignificant, but they win Scrabble games. The official TWL06 dictionary contains 107 valid two-letter words. Most casual players know maybe 40 of them. Tournament players know all 107 cold, including the 18 that don't use any standard vowel. If you can match a tournament player's two-letter vocabulary, you'll discover that the modest-looking corner of the board is where most close games are actually decided.

This guide is organized into three sections: the 107 valid words sorted by usefulness, the parallel-play tactic that turns them into 20+ point scores, and a memorization plan that gets you fluent in about two weeks of casual practice.

The 107 valid two-letter words, by frequency of usefulness

Words appear in roughly the order tournament players reach for them. The first tier — vowel-heavy words anchored on common letters — appear in most racks. The last tier — Q-words, J-words, and the truly bizarre — are situational but win games when they come up.

Tier 1: The 30 you must know first

These are the workhorses. Most Scrabble racks contain at least three of these as parallel-play candidates. If you only learn 30 two-letter words, learn these:

• AA — rough, jagged lava. Notable as one of two valid Scrabble words containing only A's.
• AB — an abdominal muscle (informal). Plural ABS.
• AD — an advertisement. Plural ADS.
• AE — one (Scots English). One of the most useful single-vowel words.
• AH — an exclamation of surprise.
• AI — a three-toed sloth.
• AL — an East Indian tree.
• AM — first-person singular of to be.
• AN — the indefinite article before a vowel sound.
• AR — the letter R, spelled out.
• AS — to the same degree.
• AT — in the location of.
• AW — exclamation expressing protest or sympathy.
• AX — variant of AXE. Worth 10 points on its own.
• AY — an affirmative vote.
• BE, BI, BO, BY — all valid; BO is a tree, BI is a bisexual person.
• DE — of or from (in French-derived names).
• DO — the first note of the diatonic scale.
• EH — used to express doubt.
• EL — the letter L.
• EM — the letter M; also a printing measure equal to a square of type.
• EN — the letter N; printing measure half an em.
• ER — exclamation of hesitation.
• ES — the letter S, spelled.
• ET — past tense of eat (dialectal).

Tier 2: The next 35 — slightly less obvious but very common

• EX — a former spouse. Worth 9 base points; lethal on a triple letter.
• FA — the fourth note of the scale.
• FE — a Hebrew letter.
• GO — to move along.
• HA — exclamation of surprise.
• HE, HI, HM, HO — all valid. HM is a thinking sound.
• ID — the psychic id (Freudian).
• IF — conditional.
• IN, IS, IT — all extremely common.
• JO — a sweetheart (Scots). Worth 9 base points.
• KA — the spiritual self in Egyptian religion.
• LA — the sixth note.
• LI — a Chinese unit of distance.
• LO — used to attract attention.
• MA, ME, MI, MM, MO, MU, MY — all valid. MM is an exclamation.
• NA — no, not (Scots).
• NE — born with the name of (in genealogical notes).
• NO, NU — NU is a Greek letter.
• OE — a whirlwind off the Faeroe Islands (TWL: valid; useful with the O glut).
• OF, OH, OI, OK, OM, ON, OP, OR, OS, OW, OX, OY — every one of these is valid. OX is worth 9.
• PA, PE, PI — PE is a Hebrew letter, PI a Greek one.

Tier 3: The vowel-light specialists

These are the words that win games. They use letters that are otherwise hard to unload — Q, X, Z, K — or letter combinations that look impossible:

• QI — vital energy (Chinese philosophy). The single most useful word in tournament Scrabble: it lets you play a Q without a U. Earns roughly 11 points on the bare board, 30+ with a bonus square.
• XI — the 14th Greek letter. Worth 9 on the bare board.
• XU — a monetary unit of Vietnam. Worth 9.
• ZA — informal for pizza (TWL: yes, since 2006). Worth 11.
• UH, UM, UN, UP, US, UT — UT is an old name for the note DO.
• WE, WO — WO is a variant of WOE.
• YA, YE, YO — YE is the old form of THE.
• SH, TI, TO — SH is the request for silence.

Note that QI alone justifies memorizing this entire list. There is no other letter in Scrabble worse to be stuck with than the Q on a U-less rack; without QI, you have a 4-point penalty in your hand and no way to use the highest-value tile in the game. With QI, the Q goes from a curse to a 30-point opportunity.

The parallel-play tactic that triples your score

Two-letter words feel weak in isolation. Played in parallel against an existing word, they become some of the highest-scoring plays in the game. Here's the basic shape:

The key principle: when you play a two-letter word parallel to an existing word, every letter you place must also form a valid two-letter word with the letter directly above or below it. This is why the 107-word list matters — you need to verify the cross-words instantly, in your head, without checking the dictionary.

Five parallel-play patterns worth memorizing

1. The Q-bomb. Play QI next to any I-ending word. Examples: bingo opens with ___I → play QI parallel → score 11 base plus any bonuses, plus the new word formed with the lower letter.
2. The Z-slot. ZA, ZO (CSW only), ZE, and ZS are all valid in various dictionaries. ZA on a triple-letter is 30 points minimum.
3. The vowel parade. When you have AA, AE, AI, AO (CSW), or similar vowel-heavy racks, look for places where you can stack two vowel-words in a row. AE-AI parallel plays are common when the board has wide-open A territory.
4. The S-pluralizer. Adding an S to the end of an existing word, while simultaneously starting a new two-letter word downward, is one of the highest-value plays in the game. Look for words ending in a letter that pairs well with an S — IS, OS, ES, AS, US all work.
5. The hook. Hooks add a single letter to the start or end of an existing word, transforming it into a different valid word, while simultaneously playing a new word perpendicular. The classic example: hook a T onto the front of HE to make THE, while playing TIN or TAR downward.

A two-week memorization plan

You don't need to drill flashcards. Here's a low-effort plan that gets you fluent:

1. Days 1-3: Read the Tier 1 list above. Just read it, twice a day. No quizzing yet.
2. Days 4-7: Add Tier 2. Play one short game of Scrabble (online or with a partner) per day. Don't try to use the words — just notice when an opportunity comes up.
3. Days 8-11: Add Tier 3. Now actively look for parallel-play opportunities. Don't worry about scoring; just place two-letter words wherever the rules allow them.
4. Days 12-14: Pure pattern-recognition practice. Go to the two-letter quiz of your choice (Aerolith and Zyzzyva are tournament-grade) and quiz yourself on the full list. Aim for 100/107 with under 30 seconds total time.

After two weeks, you'll find that two-letter words pop into your head automatically when you look at the board. The skill never fully decays — once you've internalized which letter-pairs are valid, you'll spot them in seconds for the rest of your life.

Words that look valid but aren't

Memorizing the list is half the battle. Knowing what's not on the list is the other half. The following two-letter combinations look reasonable but are not valid in TWL06:

• IO — looks like a moon of Jupiter but proper nouns are excluded. (CSW: valid.)
• GU — only valid in CSW, not TWL.
• OE — TWL: valid! Many casual players assume otherwise.
• SI — valid in CSW, not TWL.
• OU, UR, UE, YU — all CSW-only.
• IN-, UN-, RE- as standalone — prefixes are not valid as words.
• TV, PC, PR — abbreviations are not valid.

Common mistakes

1. Playing two-letter words in isolation. A two-letter word on the bare middle of the board is worth ~5 points. The same word played as part of a parallel sequence can be worth 30+. Never play a two-letter word as a single word — wait for a parallel opportunity.
2. Forgetting the cross-words. If you play AE under an existing R, you're not just playing AE — you're also playing the new word RA (or AR, depending on direction). Always check both directions before committing.
3. Burning your S tiles too early. S tiles are precious because they enable the parallel-play pluralization tactic. Don't play an S in an isolated rack unless it earns at least 12 points; save it for a setup.

Where to verify a word

This guide reflects the TWL06 dictionary as of 2014. If you suspect a word has been added or removed since then, the authoritative sources are:

• North American Scrabble Players Association (NASPA) — official TWL maintainer.
• Collins Scrabble Words — official CSW maintainer for international play.
• Our own unscrambler tool — type any 2-letter combination and we'll tell you if it's in the TWL.

Two-letter words are the closest thing Scrabble has to free points. Spend two weeks learning them, and you'll see your average score jump by 30-50 points per game — the difference between a casual player and someone who consistently wins.