GIBBER is a playable word

gibber Scrabble® Dictionary

verb
gibbered, gibbering, gibbers
to jabber
27 Playable Words can be made from "GIBBER"
   2-Letter Words (5 found)
   3-Letter Words (13 found)
   4-Letter Words (6 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)