sunset vs eventide

sunset and eventide both are nouns.

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

sunset (noun)	eventide (noun)
the daily event of the sun sinking below the horizon	the latter part of the day (the period of decreasing daylight from late afternoon until nightfall)
atmospheric phenomena accompanying the daily disappearance of the sun
the time in the evening at which the sun begins to fall below the horizon

sunset (adjective)	eventide (adjective)
providing for termination
of a declining industry or technology