There are 2 two-letter words hiding in on: one comes from rearranging its letters, and on itself is already a playable word with no unscrambling required. Here the everyday answers and the top-scoring plays are one and the same: no and on, worth 2 points apiece in Scrabble.
The full list follows, sorted A to Z; every score reflects tile constraints and skips board bonuses.
on appears in the word lists that Scrabble and Words With Friends validate against, so the rack is playable exactly as it stands and needs no unscrambling. Its two letters score 2 points in Scrabble and 3 points in Words With Friends. The 1-point gap between the two totals comes from the tile values themselves: Scrabble and Words With Friends price the same letters differently.
Dictionaries record three senses for on. Scrabble and Words With Friends score tiles and not meanings, so every sense below is worth the same 2 points on a Scrabble board:
on is one of two two-letter words the same letters produce. No arrangement of the same tiles scores higher in Scrabble, so playing on unchanged also takes the maximum points these letters offer.
The highest-scoring plays from these letters are no and on, worth 2 points in Scrabble, and nothing else built from on earns more points in Scrabble. Words With Friends prices the same letters differently, so the top of the list changes on a Words With Friends board. Both scores count tile values only and exclude premium squares.
The letters in on produce 2 valid words in the Scrabble and Words With Friends dictionaries. The word count by length is: 2 two-letter words.
The anagram solver inside UnscrambleX compares on against the dictionaries used by Scrabble, Words With Friends, Word Jumble, and Text Twist, keeps every arrangement those dictionaries contain, and sorts the confirmed words by tile score. That sorting step is why no and on appear at the top of the results. A word on this page is a legal play in Scrabble and Words With Friends, not a letter combination that only looks like a word.
Unscrambling on produces two kinds of plays in Scrabble and Words With Friends: one high-scoring word, and one short word that fits a crowded board.
The high-scoring play is no. The short plays are no and on, and they cover the turns when the board leaves no open line long enough for the bigger word.
The score gap is exact: the lowest-scoring word from these letters earns 2 points in Scrabble and the highest-scoring word earns 2 points. The letters are identical in both cases, so the board decides the value of the turn.
UnscrambleX lists every word from these letters with its Scrabble score and its Words With Friends score, so the choice between points and board position is made from numbers instead of memory.
The results list works as a vocabulary drill for Scrabble and Words With Friends players. Cover the list, rearrange on in your head, and count how many of the 2 words you find before you check the answers.
Experienced players find the long words such as no and on without help. The short words are the ones that go unnoticed, and short words decide close games in Scrabble, Words With Friends, and Text Twist.
Repeat the drill on a few letter sets each day. Vowel positions, common endings such as -ed and -ing, and high-value tiles become recognisable without an unscrambler.
Unscrambling adds words that reading never supplies. No Scrabble player opens a dictionary to look for no, and the word enters a playable vocabulary only because a results list produced it.
Spelling accuracy improves at the same time. Building no from loose tiles forces one letter order and returns a correct or incorrect verdict inside the same move, which is faster feedback than a spelling test. Plays from on range from 2 to 2 points in Scrabble, so every turn also asks a scoring question: take the points now, or keep the flexible tiles for the next turn.
Words assembled from tiles are remembered better than words only read, and timed games such as Text Twist and Word Jumble reward that recall directly.