risk vs risky

risk is a noun but risky is not a noun.

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

risk (noun)	risky (noun)
a venture undertaken without regard to possible loss or injury
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 (adjective)	risky (adjective)
	involving risk or danger
	not financially safe or secure

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