perilous vs peril

perilous is not a noun while peril is a noun.

Word	Noun	Adjective	Verb	Adverb
perilous	No	Yes	No	No
peril	Yes	No	Yes	No

perilous (noun)	peril (noun)
	a venture undertaken without regard to possible loss or injury
	a source of danger; a possibility of incurring loss or misfortune
	a state of danger involving risk

perilous (adjective)	peril (adjective)
fraught with danger

perilous (verb)	peril (verb)
	put in a dangerous, disadvantageous, or difficult position
	pose a threat to; present a danger to