risk vs adventure

risk and adventure both are nouns.

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

As verbs, adventure is a hyponym of risk; that is, adventure is a word with a more specific, narrower meaning than risk:

Other hyponyms of risk include hazard, jeopardize, stake, venture, bell the cat.

As verbs, risk and adventure are synonyms defined as:

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

risk (noun)	adventure (noun)
a venture undertaken without regard to possible loss or injury	a wild and exciting undertaking (not necessarily lawful)
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

risk (verb)	adventure (verb)
expose to a chance of loss or damage	put at risk
take a risk in the hope of a favorable outcome	take a risk in the hope of a favorable outcome