TRIPLING is a playable word

triple Scrabble® Dictionary

verb
tripled, tripling, triples
to make three times as great
59 Playable Words can be made from "TRIPLING"
   2-Letter Words (6 found)
   3-Letter Words (17 found)
   5-Letter Words (6 found)
   6-Letter Words (6 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)