SYNAPSIS 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
100 Playable Words can be made from "SYNAPSIS"
   2-Letter Words (11 found)
   3-Letter Words (32 found)
   6-Letter Words (1 found)
   8-Letter Words (1 found)