crackle vs thud

crackle and thud both are nouns.

Word	Noun	Adjective	Verb	Adverb
crackle	Yes	Yes	Yes	No
thud	Yes	No	Yes	No

As verbs, thud is a hyponym of crackle; that is, thud is a word with a more specific, narrower meaning than crackle:

Other hyponyms of crackle include crump, scrunch.

crackle (noun)	thud (noun)
glazed china with a network of fine cracks on the surface	a heavy dull sound (as made by impact of heavy objects)
the sharp sound of snapping noises

crackle (adjective)	thud (adjective)
having the surface decorated with a network of fine cracks, as in crackleware

crackle (verb)	thud (verb)
to become, or to cause to become, covered with a network of small cracks	strike with a dull sound
make a crushing noise	make a dull sound
make a crackling sound	make a noise typical of an engine lacking lubricants