victim vs easy mark

victim and easy mark both are nouns.

Word	Noun	Adjective	Verb	Adverb
victim	Yes	No	No	No
easy mark	Yes	No	No	No

As nouns, easy mark is a hyponym of victim; that is, easy mark is a word with a more specific, narrower meaning than victim:

victim (noun)	easy mark (noun)
an unfortunate person who suffers from some adverse circumstance	a defenseless victim
a person who is tricked or swindled