debunk vs roast

debunk is not a noun while roast is a noun.

Word	Noun	Adjective	Verb	Adverb
debunk	No	No	Yes	No
roast	Yes	Yes	Yes	No

As verbs, roast is a hypernym of debunk; that is, roast is a word with a broader meaning than debunk:

debunk: expose while ridiculing; especially of pretentious or false claims and ideas
roast: subject to laughter or ridicule

Other hypernyms of debunk include blackguard, guy, jest at, laugh at, make fun, poke fun, rib, ridicule.

debunk (noun)	roast (noun)
	negative criticism
	a piece of meat roasted or for roasting and of a size for slicing into more than one portion

debunk (adjective)	roast (adjective)
	(meat) cooked by dry heat in an oven

debunk (verb)	roast (verb)
expose while ridiculing; especially of pretentious or false claims and ideas	cook with dry heat, usually in an oven
	subject to laughter or ridicule