threaten vs endanger

threaten and endanger both are verbs.

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

As verbs, threaten and endanger are synonyms defined as:

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

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