GIBBERS is a playable word

gibber Scrabble® Dictionary

verb
gibbered, gibbering, gibbers
to jabber
71 Playable Words can be made from "GIBBERS"
   2-Letter Words (8 found)
   3-Letter Words (24 found)
   5-Letter Words (10 found)
   6-Letter Words (3 found)
   7-Letter Words (1 found)