eve vs daytime

eve and daytime both are nouns.

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

As nouns, daytime is a hypernym of eve; that is, daytime is a word with a broader meaning than eve:

eve: the latter part of the day (the period of decreasing daylight from late afternoon until nightfall)
daytime: the time after sunrise and before sunset while it is light outside

Other hypernyms of eve include day, daylight.

eve (noun)	daytime (noun)
the latter part of the day (the period of decreasing daylight from late afternoon until nightfall)	the time after sunrise and before sunset while it is light outside
the day before
the period immediately before something