laugh at vs lampoon

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

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

As verbs, lampoon is a hyponym of laugh at; that is, lampoon is a word with a more specific, narrower meaning than laugh at:

Other hyponyms of laugh at include tease, satirise, satirize, debunk, expose, stultify.

laugh at (noun)	lampoon (noun)
	a composition that imitates or misrepresents somebody's style, usually in a humorous way

laugh at (verb)	lampoon (verb)
subject to laughter or ridicule	ridicule with satire