crepuscle vs crepuscule

crepuscle and crepuscule both are nouns.

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

As nouns, crepuscle and crepuscule are synonyms defined as:

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

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