clack vs clatter

clack and clatter both are nouns.

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

As verbs, clack and clatter are synonyms defined as:

Other synonyms of clack include brattle.

clack (noun)	clatter (noun)
a simple valve with a hinge on one side; allows fluid to flow in only one direction	a rattling noise (often produced by rapid movement)
a sharp abrupt noise as if two objects hit together; may be repeated

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