late-night hour vs night

late-night hour and night both are nouns.

Word	Noun	Adjective	Verb	Adverb
late-night hour	Yes	No	No	No
night	Yes	No	No	No

late-night hour (noun)	night (noun)
the latter part of night	darkness
	the time after sunset and before sunrise while it is dark outside
	a period of ignorance or backwardness or gloom
	the dark part of the diurnal cycle considered a time unit
	the time between sunset and midnight
	the period spent sleeping
	a shortening of nightfall