guy vs jest at

guy is a noun but jest at is not a noun.

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

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

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

guy (noun)	jest at (noun)
a cable, wire, or rope that is used to brace something (especially a tent)
an informal term for a youth or man

guy (verb)	jest at (verb)
steady or support with a guy wire or cable	subject to laughter or ridicule
subject to laughter or ridicule