peril vs threaten

peril is a noun but threaten is not a noun.

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

As verbs, peril and threaten are synonyms defined as:

Other synonyms of peril include endanger, imperil, jeopardise, jeopardize, menace.

peril (noun)	threaten (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

peril (verb)	threaten (verb)
put in a dangerous, disadvantageous, or difficult position	to utter intentions of injury or punishment against
pose a threat to; present a danger to	to be a menacing indication of something
	pose a threat to; present a danger to