MATUREST is a playable word

mature Scrabble® Dictionary

adjective
maturer, maturest
fully developed
(adverb) maturely
verb
matured, maturing, matures
to make or become mature
272 Playable Words can be made from "MATUREST"
   2-Letter Words (18 found)
   7-Letter Words (8 found)
   8-Letter Words (1 found)