dusk vs crepuscle

dusk and crepuscle both are nouns.

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

As nouns, dusk and crepuscle are synonyms defined as:

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

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

dusk (verb)	crepuscle (verb)
become dusk