SISTERS is a playable word

sister Scrabble® Dictionary

verb
sistered, sistering, sisters
to treat like a sister (a female sibling)
66 Playable Words can be made from "SISTERS"
   2-Letter Words (9 found)
   3-Letter Words (18 found)
   5-Letter Words (13 found)
   6-Letter Words (4 found)
   7-Letter Words (2 found)