DIERESIS is a playable word

dieresis Scrabble® Dictionary

noun
pl. diereses
the separation of two vowels into two syllables
(adjective) dieretic
104 Playable Words can be made from "DIERESIS"
   2-Letter Words (8 found)
   3-Letter Words (20 found)
   7-Letter Words (2 found)
   8-Letter Words (1 found)