clack vs clack valve

clack and clack valve both are nouns.

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

As nouns, clack and clack valve are synonyms defined as:

clack and clack valve: a simple valve with a hinge on one side; allows fluid to flow in only one direction

Other synonyms of clack include clapper valve.

clack (noun)	clack valve (noun)
a simple valve with a hinge on one side; allows fluid to flow in only one direction	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

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