n. 25B6; verb
Betty babbled away : PRATTLE, rattle on, gabble, chatter, jabber, twitter, go on, run on, prate, ramble, burble, blather, blether; informal gab, yak, yabber, yatter, yammer, blabber, jaw, gas, shoot one's mouth off; Brit. informal witter, rabbit, chunter, natter, waffle; N. Amer. informal run off at the mouth.
a brook babbled gently : BURBLE, murmur, gurgle, purl, tinkle; poetic/literary plash.
25B6; noun his inarticulate babble : PRATTLE, gabble, chatter, jabber, prating, rambling, blather, blether; informal gab, yak, yabbering, yatter; Brit. informal wittering, waffle, natter, chuntering.