SERENER is a playable word

serene Scrabble® Dictionary

adjective
serener, serenest
calm; tranquil
(adverb) serenely
noun
pl. serenes
a serene condition or expanse
33 Playable Words can be made from "SERENER"
   2-Letter Words (5 found)
   3-Letter Words (11 found)
   4-Letter Words (9 found)
   5-Letter Words (4 found)
   6-Letter Words (2 found)
   7-Letter Words (2 found)