crapshooter vs gambler

crapshooter and gambler both are nouns.

Word	Noun	Adjective	Verb	Adverb
crapshooter	Yes	No	No	No
gambler	Yes	No	No	No

As nouns, gambler is a hypernym of crapshooter; that is, gambler is a word with a broader meaning than crapshooter:

crapshooter: a gambler who plays the game of craps
gambler: a person who wagers money on the outcome of games or sporting events

crapshooter (noun)	gambler (noun)
a gambler who plays the game of craps	a person who wagers money on the outcome of games or sporting events
	someone who risks loss or injury in the hope of gain or excitement