BYSSI is a playable word

byssus Scrabble® Dictionary

noun
pl. byssuses or byssi
a fine linen
(adjective) byssal
10 Playable Words can be made from "BYSSI"
   2-Letter Words (4 found)
   3-Letter Words (4 found)
   4-Letter Words (1 found)
   5-Letter Words (1 found)