endanger vs peril

endanger is not a noun while peril is a noun.

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

As verbs, endanger and peril are synonyms defined as:

endanger and peril: put in a dangerous, disadvantageous, or difficult position

Other synonyms of endanger include expose, queer, scupper.

As verbs, endanger and peril are synonyms defined as:

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

endanger (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

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