SNOOPIEST is a playable word

snoopy Scrabble® Dictionary

adjective
snoopier, snoopiest
given to snooping
(adverb) snoopily
330 Playable Words can be made from "SNOOPIEST"
   2-Letter Words (21 found)
   8-Letter Words (4 found)
   9-Letter Words (2 found)