crepitation vs crackling

crepitation and crackling both are nouns.

Word	Noun	Adjective	Verb	Adverb
crepitation	Yes	No	No	No
crackling	Yes	No	No	No

As nouns, crepitation and crackling are synonyms defined as:

Other synonyms of crepitation include crackle.

crepitation (noun)	crackling (noun)
the sharp sound of snapping noises	the sharp sound of snapping noises
	the residue that remains after animal fat has been rendered