The letters in INVISIBLE make 90 words of two letters or more. The longest is INVISIBLE at 9 letters, and the highest-scoring is INVISIBLE at 14 points.
No other single word uses all 9 letters of INVISIBLE. INVISIBLE has 9 letters: 4 vowels and 5 consonants, worth 14 points before any board bonuses.
9-letter words 1
7-letter words 1
6-letter words 5
blinis8levins9livens9sileni6snivel9
5-letter words 16
biles7bines7blini7evils8ivies8lenis5levin8liens5lines5liven8lives8nisei5veils8veins8vibes10vines8
4-letter words 32
bels6bens6bile6bine6bins6bise6blin6evil7ibis6isle4leis4lens4libs6lien4lies4line4lins4live7nebs6nevi7nibs6nils4nisi4sine4snib6veil7vein7vibe9vies7vile7vine7vise7
3-letter words 23
bel5ben5bin5bis5els3ens3ins3lei3lev6lib5lie3lin3lis3neb5nib5nil3sei3sel3sen3sib5sin3vie6vis6
2-letter words 12
be4bi4el2en2es2in2is2li2ln2ls2ne2si2
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.