TITTER is a playable word

titter Scrabble® Dictionary

verb
tittered, tittering, titters
to utter a restrained, nervous laugh
21 Playable Words can be made from "TITTER"
   2-Letter Words (6 found)
   3-Letter Words (6 found)
   4-Letter Words (4 found)
   5-Letter Words (4 found)
   6-Letter Words (1 found)