eve vs period of time

eve and period of time both are nouns.

Word	Noun	Adjective	Verb	Adverb
eve	Yes	No	No	No
period of time	Yes	No	No	No

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

Other hypernyms of eve include period, time period.

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