make fun vs roast

make fun is not a noun while roast is a noun.

Word	Noun	Adjective	Verb	Adverb
make fun	No	No	Yes	No
roast	Yes	Yes	Yes	No

As verbs, make fun and roast are synonyms defined as:

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

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

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

make fun (verb)	roast (verb)
subject to laughter or ridicule	cook with dry heat, usually in an oven
	subject to laughter or ridicule