GAINING is a playable word

gain Scrabble® Dictionary

verb
gained, gaining, gains
to acquire
(adjective) gainable
23 Playable Words can be made from "GAINING"
   2-Letter Words (6 found)
   3-Letter Words (10 found)
   4-Letter Words (5 found)
   5-Letter Words (1 found)
   7-Letter Words (1 found)