clatter vs clack

clatter and clack both are nouns.

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

As verbs, clatter and clack are synonyms defined as:

Other synonyms of clatter include brattle.

clatter (noun)	clack (noun)
a rattling noise (often produced by rapid movement)	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

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