jest at vs roast

jest at is not a noun while roast is a noun.

Word	Noun	Adjective	Verb	Adverb
jest at	No	No	Yes	No
roast	Yes	Yes	Yes	No

As verbs, jest at and roast are synonyms defined as:

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

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

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

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