poke fun vs roast

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

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

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

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

poke 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

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

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