wagerer vs gambler

wagerer and gambler both are nouns.

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

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

wagerer: someone who bets
gambler: a person who wagers money on the outcome of games or sporting events

wagerer (noun)	gambler (noun)
someone who bets	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