clack vs brattle

clack is a noun but brattle is not a noun.

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

As verbs, clack and brattle are synonyms defined as:

Other synonyms of clack include clatter.

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