COMPACTEST is a playable word

compact Scrabble® Dictionary

adjective
compacter, compactest
closely and firmly united
verb
compacted, compacting, compacts
to pack closely together
409 Playable Words can be made from "COMPACTEST"
   2-Letter Words (21 found)
   3-Letter Words (82 found)
   8-Letter Words (1 found)
   10-Letter Words (1 found)