laugh at vs ridicule

laugh at is not a noun while ridicule is a noun.

Word	Noun	Adjective	Verb	Adverb
laugh at	No	No	Yes	No
ridicule	Yes	No	Yes	No

As verbs, laugh at and ridicule are synonyms defined as:

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

laugh at (noun)	ridicule (noun)
	the act of deriding or treating with contempt
	language or behavior intended to mock or humiliate

laugh at (verb)	ridicule (verb)
subject to laughter or ridicule	subject to laughter or ridicule