gambler vs adventurer

gambler and adventurer both are nouns.

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

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

Other hypernyms of gambler include venturer.

gambler (noun)	adventurer (noun)
a person who wagers money on the outcome of games or sporting events	a person who enjoys taking risks
someone who risks loss or injury in the hope of gain or excitement	someone who travels into little known regions (especially for some scientific purpose)