There are 74 words hidden in the letters of FUNCTION, from 12 two-letter words up to FUNCTION (8 letters). For points, FUNCTION is best at 13.
No other single word uses all 8 letters of FUNCTION. FUNCTION has 8 letters: 3 vowels and 5 consonants, worth 13 points before any board bonuses.
8-letter words 1
7-letter words 1
unction9
6-letter words 2
confit11nuncio8
5-letter words 11
conin7count7cutin7fount8futon8niton5ontic7tonic7tunic7unfit8union5
4-letter words 23
cion6coft9coif9coin6coni6conn6cuif9fico9fino7foci9foin7font7fuci9icon6info7into4noun4otic6tofu7unci6unco6unit4unto4
3-letter words 24
con5cot5cut5fin6fit6fon6fou6fun6inn3ion3nit3non3not3nun3nut3oft6oui3out3tic5tin3ton3tui3tun3uni3
2-letter words 12
if5in2it2no2nu2of5oi2on2ti2to2un2ut2
Words are from our open word list and include some game-only words. Rude words are left out of this page; the unscrambler shows every valid word, lets you add blank tiles and filter by length.