rib vs laugh at

rib is a noun but laugh at is not a noun.

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

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

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

rib (noun)	laugh at (noun)
support resembling the rib of an animal
a projecting molding on the underside of a vault or ceiling; may be ornamental or structural
any of the 12 pairs of curved arches of bone extending from the spine to or toward the sternum in humans (and similar bones in most vertebrates)
a riblike supporting or strengthening part of an animal or plant
a teasing remark
cut of meat including one or more ribs

rib (verb)	laugh at (verb)
subject to laughter or ridicule	subject to laughter or ridicule
form vertical ribs by knitting