gouger vs con artist

gouger and con artist both are nouns.

Word	Noun	Adjective	Verb	Adverb
gouger	Yes	No	No	No
con artist	Yes	No	No	No

As nouns, con artist is a hyponym of gouger; that is, con artist is a word with a more specific, narrower meaning than gouger:

gouger (noun)	con artist (noun)
a person who swindles you by means of deception or fraud	a swindler who exploits the confidence of his victim
an attacker who gouges out the antagonist's eye