crackling vs crepitation

crackling and crepitation both are nouns.

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

As nouns, crackling and crepitation are synonyms defined as:

Other synonyms of crackling include crackle.

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