flimflam vs fraud

flimflam and fraud both are nouns.

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

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

flimflam: a swindle in which you cheat at gambling or persuade a person to buy worthless property
fraud: the act of swindling by some fraudulent scheme

Other hypernyms of flimflam include cheat, rig, swindle.

flimflam (noun)	fraud (noun)
a swindle in which you cheat at gambling or persuade a person to buy worthless property	intentional deception resulting in injury to another person
	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