nightfall vs gloaming

nightfall and gloaming both are nouns.

Word	Noun	Adjective	Verb	Adverb
nightfall	Yes	No	No	No
gloaming	Yes	No	No	No

As nouns, nightfall and gloaming are synonyms defined as:

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

nightfall (noun)	gloaming (noun)
the time of day immediately following sunset	the time of day immediately following sunset