prohibition era vs time period

prohibition era and time period both are nouns.

Word	Noun	Adjective	Verb	Adverb
prohibition era	Yes	No	No	No
time period	Yes	No	No	No

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

prohibition era: the period from 1920 to 1933 when the sale of alcoholic beverages was prohibited in the United States by a constitutional amendment
time period: an amount of time

Other hypernyms of prohibition era include period, period of time.

prohibition era (noun)	time period (noun)
the period from 1920 to 1933 when the sale of alcoholic beverages was prohibited in the United States by a constitutional amendment	an amount of time