eve vs eventide

eve and eventide both are nouns.

Word	Noun	Adjective	Verb	Adverb
eve	Yes	No	No	No
eventide	Yes	No	No	No

As nouns, eve and eventide are synonyms defined as:

eve and eventide: the latter part of the day (the period of decreasing daylight from late afternoon until nightfall)

Other synonyms of eve include even, evening.

eve (noun)	eventide (noun)
the latter part of the day (the period of decreasing daylight from late afternoon until nightfall)	the latter part of the day (the period of decreasing daylight from late afternoon until nightfall)
the day before
the period immediately before something