gamble vs risk

gamble and risk both are nouns.

Word	Noun	Adjective	Verb	Adverb
gamble	Yes	No	Yes	No
risk	Yes	No	Yes	No

As nouns, risk is a hypernym of gamble; that is, risk is a word with a broader meaning than gamble:

Other hypernyms of gamble include danger, peril.

As verbs, gamble and risk are synonyms defined as:

Other synonyms of gamble include adventure, chance, hazard, run a risk, take a chance, take chances.

gamble (noun)	risk (noun)
a risky act or venture	a venture undertaken without regard to possible loss or injury
money that is risked for possible monetary gain	the probability of being exposed to an infectious agent
	the probability of becoming infected given that exposure to an infectious agent has occurred
	a source of danger; a possibility of incurring loss or misfortune

gamble (verb)	risk (verb)
play games for money	expose to a chance of loss or damage
take a risk in the hope of a favorable outcome	take a risk in the hope of a favorable outcome