danger vs threat

danger and threat both are nouns.

Word	Noun	Adjective	Verb	Adverb
danger	Yes	No	No	No
threat	Yes	No	No	No

As nouns, threat is a hyponym of danger; that is, threat is a word with a more specific, narrower meaning than danger:

Other hyponyms of danger include endangerment, hazard, jeopardy, peril, risk, powder keg, menace.

danger (noun)	threat (noun)
a venture undertaken without regard to possible loss or injury	a warning that something unpleasant is imminent
a dangerous place	declaration of an intention or a determination to inflict harm on another
the condition of being susceptible to harm or injury	a person who inspires fear or dread
a cause of pain or injury or loss	something that is a source of danger