fraud vs cheater

fraud and cheater both are nouns.

Word	Noun	Adjective	Verb	Adverb
fraud	Yes	No	No	No
cheater	Yes	No	No	No

As nouns, cheater is a hypernym of fraud; that is, cheater is a word with a broader meaning than fraud:

Other hypernyms of fraud include beguiler, cheat, deceiver, slicker, trickster.

fraud (noun)	cheater (noun)
intentional deception resulting in injury to another person	someone who leads you to believe something that is not true
something intended to deceive; deliberate trickery intended to gain an advantage
the act of swindling by some fraudulent scheme
a person who makes deceitful pretenses