The letters in ARBITRARY make 64 words of two letters or more. The longest is ARBITRARY at 9 letters, and the highest-scoring is ARBITRARY at 14 points.
No other single word uses all 9 letters of ARBITRARY. ARBITRARY has 9 letters: 3 vowels and 6 consonants, worth 14 points before any board bonuses.
9-letter words 1
8-letter words 1
barratry13
6-letter words 3
baryta11briary11rarity9
5-letter words 8
array8atria5briar7rabat7riata5tarry8tayra8tiara5
4-letter words 16
abri6airt4airy7aria4arty7bait6birr6brat6bray9brit6brrr6raia4rata4raya7tray7yirr7
3-letter words 22
aba5aby8air3ait3arb5art3baa5bar5bat5bay8bit5bra5brr5rat3ray6ria3rib5rya6tab5tar3try6yar6
2-letter words 13
aa2ab4ai2ar2at2ay5ba4bi4by7it2ta2ti2ya5
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.