SEPTET is a playable word

septet Scrabble® Dictionary

noun
pl. septets
a group of seven
27 Playable Words can be made from "SEPTET"
   2-Letter Words (4 found)
   3-Letter Words (10 found)
   4-Letter Words (11 found)
   5-Letter Words (1 found)
   6-Letter Words (1 found)