four-flusher vs cheater

four-flusher and cheater both are nouns.

Word	Noun	Adjective	Verb	Adverb
four-flusher	Yes	No	No	No
cheater	Yes	No	No	No

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

Other hypernyms of four-flusher include beguiler, cheat, deceiver, slicker, trickster.

four-flusher (noun)	cheater (noun)
a person who tries to bluff other people	someone who leads you to believe something that is not true