clunking vs clopping

clunking and clopping both are nouns.

Word	Noun	Adjective	Verb	Adverb
clunking	Yes	No	No	No
clopping	Yes	No	No	No

As nouns, clunking and clopping are synonyms defined as:

clunking and clopping: the sound of a horse's hoofs hitting on a hard surface

Other synonyms of clunking include clip-clop, clippety-clop, clop, clumping.

clunking (noun)	clopping (noun)
the sound of a horse's hoofs hitting on a hard surface	the sound of a horse's hoofs hitting on a hard surface