TRIGRAM is a playable word

trigram Scrabble® Dictionary

noun
pl. trigrams
a cluster of three successive letters
57 Playable Words can be made from "TRIGRAM"
   2-Letter Words (11 found)
   3-Letter Words (26 found)
   4-Letter Words (17 found)
   5-Letter Words (2 found)
   7-Letter Words (1 found)