crepuscle vs dusk

crepuscle and dusk both are nouns.

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

As nouns, crepuscle and dusk are synonyms defined as:

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

crepuscle (noun)	dusk (noun)
the time of day immediately following sunset	the time of day immediately following sunset

crepuscle (verb)	dusk (verb)
	become dusk