night vs dusk

night and dusk both are nouns.

Word	Noun	Adjective	Verb	Adverb
night	Yes	No	No	No
dusk	Yes	No	Yes	No

As nouns, dusk is a hypernym of night; that is, dusk is a word with a broader meaning than night:

Other hypernyms of night include crepuscle, crepuscule, evenfall, fall, gloam, gloaming, nightfall, twilight.

night (noun)	dusk (noun)
darkness	the time of day immediately following sunset
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

night (verb)	dusk (verb)
	become dusk