SYNAPSES is a playable word

synapsis Scrabble® Dictionary

noun
pl. synapses
the point at which a nervous impulse passes from one neuron to another
(adjective) synaptic
121 Playable Words can be made from "SYNAPSES"
   2-Letter Words (12 found)
   6-Letter Words (6 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)