clack

nouns

a sharp abrupt noise as if two objects hit together; may be repeated
clack, clap
a simple valve with a hinge on one side; allows fluid to flow in only one direction
clack, clack valve, clapper valve

verbs

make a rattling sound
"clattering dishes"
brattle, clack, clatter
make a clucking sounds, characteristic of hens
clack, click, cluck
speak (about unimportant matters) rapidly and incessantly
blab, blabber, chatter, clack, gabble, gibber, maunder, palaver, piffle, prate, prattle, tattle, tittle-tattle, twaddle