prate vs clack

prate and clack both are nouns.

Word	Noun	Adjective	Verb	Adverb
prate	Yes	No	Yes	No
clack	Yes	No	Yes	No

As verbs, prate and clack are synonyms defined as:

prate and clack: speak (about unimportant matters) rapidly and incessantly

prate (noun)	clack (noun)
idle or foolish and irrelevant talk	a simple valve with a hinge on one side; allows fluid to flow in only one direction
	a sharp abrupt noise as if two objects hit together; may be repeated

prate (verb)	clack (verb)
speak (about unimportant matters) rapidly and incessantly	speak (about unimportant matters) rapidly and incessantly
	make a clucking sounds, characteristic of hens
	make a rattling sound