gibber

nouns

unintelligible talking
gibber, gibberish

verbs

speak (about unimportant matters) rapidly and incessantly
blab, blabber, chatter, clack, gabble, gibber, maunder, palaver, piffle, prate, prattle, tattle, tittle-tattle, twaddle
chatter inarticulately; of monkeys
gibber
is derived from
gibberish
is a type of (narrower)
express audibly; utter sounds (not necessarily words)
"She let out a big heavy sigh"; "He uttered strange sounds that nobody could understand"
emit, let loose, let out, utter