BIENNIUM is a playable word

biennium Scrabble® Dictionary

noun
pl. bienniums or biennia
a period of two years
47 Playable Words can be made from "BIENNIUM"
   2-Letter Words (12 found)
   3-Letter Words (15 found)
   4-Letter Words (11 found)
   5-Letter Words (7 found)
   6-Letter Words (1 found)
   8-Letter Words (1 found)