chatterbox vs chatterer

chatterbox and chatterer both are nouns.

Word	Noun	Adjective	Verb	Adverb
chatterbox	Yes	No	No	No
chatterer	Yes	No	No	No

As nouns, chatterbox and chatterer are synonyms defined as:

chatterbox and chatterer: an obnoxious and foolish and loquacious talker

Other synonyms of chatterbox include babbler, magpie, prater, spouter.

chatterbox (noun)	chatterer (noun)
an obnoxious and foolish and loquacious talker	passerine bird of New World tropics
orchid growing along streams or ponds of western North America having leafy stems and 1 greenish-brown and pinkish flower in the axil of each upper leaf	an obnoxious and foolish and loquacious talker