decrepitation vs crackling

decrepitation and crackling both are nouns.

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

As nouns, crackling is a hypernym of decrepitation; that is, crackling is a word with a broader meaning than decrepitation:

decrepitation: the crackling or breaking up of certain crystals when they are heated
crackling: the sharp sound of snapping noises

Other hypernyms of decrepitation include crackle, crepitation.

decrepitation (noun)	crackling (noun)
the crackling or breaking up of certain crystals when they are heated	the sharp sound of snapping noises
	the residue that remains after animal fat has been rendered