SYNESIS is a playable word

synesis Scrabble® Dictionary

noun
pl. synesises
a type of grammatical construction
31 Playable Words can be made from "SYNESIS"
   2-Letter Words (7 found)
   3-Letter Words (11 found)
   4-Letter Words (8 found)
   5-Letter Words (4 found)
   7-Letter Words (1 found)