The Best Two-Letter Words in Scrabble®
Why two-letter words matter more than any other length.
There are only a few dozen valid two-letter words in tournament Scrabble® dictionaries, which makes them the single most memorizable, highest-leverage category of vocabulary in the entire game — and yet most casual players know fewer than ten of them.
Why length two matters more than it should
In Scrabble® and Words With Friends® alike, "parallel play" — lining a new word up next to an existing one so every tile you add also completes its own short word running the other way — is how strong players extract extra points from a single placement. This only works if you actually know which two-letter combinations are valid; a player who doesn't recognize AA, XI, or ZA as real words will pass over board positions a more prepared opponent would exploit.
Vowel-only two-letter words
AA (a type of rough, cindery lava) and AI (a three-toed sloth) are two of the more surprising entries in the two-letter list, both borrowed into English from other sources rather than native constructions. These are worth specifically remembering because a rack with too many vowels and no consonants to pair them with otherwise feels unplayable.
The high-value short words
QI (vital life-force energy in Chinese philosophy) and XU (a Vietnamese monetary unit) both carry outsized point value for their length, since Q and X are both worth significant points on their own — a two-letter word with one of these letters can be a legitimately strong play even without hitting a bonus square, since the raw tile value is already high relative to the word's length.
Common but underused
Words like OD, OM, OP, OY, and OE round out the O-initial two-letter set — the kind of entry a well-studied player rattles off without hesitation while a casual one has simply never seen it written down. None require rare letters, which means the barrier to using them is pure memorization, not luck of the draw.
How to actually memorize the list
Grouping by first letter, rather than trying to memorize the list alphabetically as one long string, tends to stick better — most people can hold "the A-words," "the O-words," and so on as smaller chunks more easily than one undifferentiated list of thirty-plus entries. See our full two-letter words list, which is grouped exactly this way, alongside each word's Scrabble® and Words With Friends® point value.
A word of caution on dictionaries
A small number of two-letter words are accepted by one major tournament word list and rejected by the other — always confirm the exact list your specific game or tournament uses before relying on an unusual one in a competitive context.
How two-letter words behave differently in Words With Friends®
The same underlying word set carries different point weight depending which app you're playing — Words With Friends®'s tile-value table pushes a few of these short words higher than their Scrabble® equivalent, since several individual letters (L and U among them) are simply worth more on that app's tiles. This doesn't change which two-letter words are worth memorizing, but it does mean a specific short word that looks unremarkable in Scrabble® scoring can be a genuinely stronger parallel-play choice in Words With Friends®, and it's worth checking both games' tile values rather than assuming one game's scoring intuition transfers directly to the other.
Digital versions of both games typically flag an invalid word attempt before it's submitted, which is a helpful safety net but also, ironically, a reason some players never bother memorizing the two-letter list properly — the app will catch an outright mistake, but it won't proactively suggest a parallel-play opportunity you didn't think to try in the first place. Knowing the list yourself is still what turns a passable game into a genuinely strong one.
A worked example of parallel play in action
Picture a board with the word CAT already placed horizontally. If you play an S vertically through the T, extending downward, you've simultaneously formed CATS (the horizontal word extended) and started a new vertical word beginning with S — if that vertical word happens to be a valid short word too (say, ST as the start of a longer word, or simply the S itself scoring against a premium square), you've drawn value from a single tile in two directions at once. This is the mechanical heart of what "parallel play" actually means at the board, not just an abstract phrase — and it only works if the player recognizes, in the moment, that the new vertical letters they're creating are themselves valid words.
A note on regional and dialect-origin words
Several two-letter words trace back to specific regional or dialect origins rather than standard modern English usage, which is worth knowing if you're curious where they actually come from rather than just memorizing them as arbitrary letter pairs. AA, for instance, is a Hawaiian-derived geological term describing a specific rough lava texture, distinct from the smoother PAHOEHOE lava (too long to be a two-letter word itself, but a related term worth knowing). Understanding a word's real origin, even briefly, tends to make it stick in memory better than treating it as a meaningless two-letter string to memorize by rote.
Two-letter words won't win a game on their own, but they're the connective tissue that makes higher-scoring parallel plays possible in the first place — time spent on this specific, small vocabulary set pays back faster than almost any other study you could do.