PROPER is a playable word

proper Scrabble® Dictionary

adjective
properer, properest
suitable
(adverb) properly
noun
pl. propers
a portion of the Mass
29 Playable Words can be made from "PROPER"
   2-Letter Words (7 found)
   3-Letter Words (9 found)
   4-Letter Words (9 found)
   5-Letter Words (3 found)
   6-Letter Words (1 found)