OSTOSIS is a playable word

ostosis Scrabble® Dictionary

noun
pl. ostosises or ostoses
the formation of bone
24 Playable Words can be made from "OSTOSIS"
   2-Letter Words (8 found)
   3-Letter Words (8 found)
   4-Letter Words (5 found)
   5-Letter Words (2 found)
   7-Letter Words (1 found)