gambler vs risk taker

gambler and risk taker both are nouns.

Word	Noun	Adjective	Verb	Adverb
gambler	Yes	No	No	No
risk taker	Yes	No	No	No

As nouns, gambler and risk taker are synonyms defined as:

gambler and risk taker: someone who risks loss or injury in the hope of gain or excitement

gambler (noun)	risk taker (noun)
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
someone who risks loss or injury in the hope of gain or excitement