understudy vs con

understudy and con both are nouns.

Word	Noun	Adjective	Verb	Adverb
understudy	Yes	No	Yes	No
con	Yes	No	Yes	Yes

As verbs, con is a hypernym of understudy; that is, con is a word with a broader meaning than understudy:

Other hypernyms of understudy include learn, memorise, memorize.

understudy (noun)	con (noun)
an actor able to replace a regular performer when required	a swindle in which you cheat at gambling or persuade a person to buy worthless property
	an argument opposed to a proposal
	a person serving a sentence in a jail or prison

understudy (verb)	con (verb)
be an understudy or alternate for a role	commit to memory; learn by heart
	deprive of by deceit

understudy (adverb)	con (adverb)
	in opposition to a proposition, opinion, etc.