HALFLIFE is a playable word

halflife Scrabble® Dictionary

noun
pl. halflives
a measure of radioactive decay
69 Playable Words can be made from "HALFLIFE"
   2-Letter Words (15 found)
   3-Letter Words (20 found)
   5-Letter Words (4 found)
   6-Letter Words (2 found)
   8-Letter Words (1 found)