twilight vs hour

twilight and hour both are nouns.

Word	Noun	Adjective	Verb	Adverb
twilight	Yes	Yes	No	No
hour	Yes	No	No	No

As nouns, hour is a hypernym of twilight; that is, hour is a word with a broader meaning than twilight:

Other hypernyms of twilight include time of day.

twilight (noun)	hour (noun)
the diffused light from the sky when the sun is below the horizon but its rays are refracted by the atmosphere of the earth	distance measured by the time taken to cover it
a condition of decline following successes	a period of time equal to 1/24th of a day
the time of day immediately following sunset	clock time
	a special and memorable period

twilight (adjective)	hour (adjective)
lighted by or as if by twilight