RUMEN is a playable word

rumen Scrabble® Dictionary

noun
pl. rumens or rumina
a part of the stomach of a ruminant
(adjective) ruminal
24 Playable Words can be made from "RUMEN"
   2-Letter Words (10 found)
   3-Letter Words (9 found)
   4-Letter Words (4 found)
   5-Letter Words (1 found)