Synonyms for Jabber:

n.

slur, mumble, equivocate, bumble, sputter, waffle. words, gibber. run on, go on, clack, spiel, jaw, blabber, gas, yak, rattle. gibber (noun)
rattle, cry, sound.
jabber (noun)
jabbering, rant, rave, spout, rabbit on, mouth off, gabble.
unmeaningness (noun)
hogwash, blather, noise, nonsense, babble, gobbledygook, meaninglessness, cipher, double talk, absurdity, senselessness, unmeaningness, drivel.

v.

communication (verb)
rant, mouth off, rabbit on, spout, rave.
speak (verb)
remark, discuss, recite, vocalize, gab, patter, chitchat, say, lecture, preach, tattle, debate, voice, speak, prattle, chatter, orate, talk.
talk incessantly and trivially (verb)
gab, babble, chatter, yak, drivel, tattle, blather, talk, mumble, jaw.

Other synonyms:

spiel, gibber, yak. jaw, gas, rattle. sound, clack. blurt
spout.
gabble
gabble.
prattle
blabber.
Other relevant words:
rattle, waffle, cry, slur, spiel, gas, jabbering, clack, gibber, mouth off, rant, mumble, words, sputter, bumble, yak, rave, sound, rabbit on, jaw, gabble, equivocate, blabber, spout, go on.

Usage examples for jabber

  1. Weevil caught up his manuscript and began to jabber again. – Furze the Cruel by John Trevena
  2. Little undersized chaps, they are all chatter and jabber and when they used to come alongside to unload, it were jest for all the world like so many boatfuls of monkeys. – The Bravest of the Brave or, with Peterborough in Spain by G. A. Henty