As verbs the difference between clapper and plapper
is that clapper is to ring a bell by pulling a rope attached to the clapper while plapper is to make a noise with the lips.
As a noun clapper
is one who claps or clapper can be (label) a rabbit burrow.
clapper
English
Etymology 1
Noun
(
en noun)
One who claps.
An object so suspended inside a bell that it may hit the bell and cause it to ring.
A wooden mechanical device used as a scarecrow; bird-scaring rattle, a wind-rattle or a wind-clapper.
(label) A pounding block.
Verb
(
en verb)
To ring a bell by pulling a rope attached to the clapper.
*
Etymology 2
.
plapper
English
Verb
(
en verb)
to make a noise with the lips
:* 1922': She took no notice while he read by rote a solfa fable for her, '''plappering flatly — James Joyce, ''Ulysses