bookie vs gambler

bookie and gambler both are nouns.

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

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

bookie: a gambler who accepts and pays off bets (especially on horse races)
gambler: a person who wagers money on the outcome of games or sporting events

bookie (noun)	gambler (noun)
a gambler who accepts and pays off bets (especially on horse races)	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