APOAPSIS is a playable word

apoapsis Scrabble® Dictionary

noun
pl. apoapsides or apoapses
the high point in an orbit
69 Playable Words can be made from "APOAPSIS"
   2-Letter Words (12 found)
   3-Letter Words (23 found)
   5-Letter Words (12 found)
   6-Letter Words (1 found)
   8-Letter Words (1 found)