The letters in BEHAVIOUR make 148 words of two letters or more. The longest is BEHAVIOUR at 9 letters, and the highest-scoring is BEHAVIOUR at 17 points.
No other single word uses all 9 letters of BEHAVIOUR. BEHAVIOUR has 9 letters: 5 vowels and 4 consonants, worth 17 points before any board bonuses.
9-letter words 1
8-letter words 1
7-letter words 2
bouvier12haviour13
6-letter words 2
havior12ourebi8
5-letter words 18
abhor10above10aiver8aurei5bevor10bohea10brave10bravi10bravo10haver11houri8hover11obeah10ourie5rehab10uraei5urbia7vireo8
4-letter words 52
abri6aero4arvo7aver7bare6bear6beau6bier6boar6bora6bore6bour6brae6brei6brie6brio6buhr9bura6euro4habu9hair7hare7have10hear7heir7herb9hero7hire7hive10hoar7hoer7hora7hour7hove10obia6ohia7over7rave7rhea7rive7robe6roue4rove7rube6urea4uvea7vair7vera7verb9vibe9vier7vire7
3-letter words 51
abo5air3arb5are3ave6avo6bah8bar5bio5boa5bra5bro5bur5ear3eau3era3hae6hao6her6hie6hob8hoe6hub8hue6ire3oar3obe5obi5ora3orb5ore3oui3our3ova6rah6reb5rei3rev6rho6ria3rib5rob5roe3rub5rue3urb5var6vau6via6vie6voe6
2-letter words 21
ab4ae2ah5ai2ar2ba4be4bi4bo4eh5er2ha5he5hi5ho5oe2oh5oi2or2re2uh5
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.