ESTRUS is a playable word

estrus Scrabble® Dictionary

noun
pl. estruses
the period of heat in female mammals
53 Playable Words can be made from "ESTRUS"
   2-Letter Words (7 found)
   3-Letter Words (15 found)
   4-Letter Words (18 found)
   5-Letter Words (9 found)
   6-Letter Words (4 found)