clack vs blether

clack and blether both are nouns.

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

As verbs, blether is a hyponym of clack; that is, blether is a word with a more specific, narrower meaning than clack:

Other hyponyms of clack include babble, blather, blither, smatter.

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

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