season vs period of time

season and period of time both are nouns.

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

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

season: one of the natural periods into which the year is divided by the equinoxes and solstices or atmospheric conditions
period of time: an amount of time

Other hypernyms of season include period, time period.

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

Other hypernyms of season include period, time period.

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

season: a period of the year marked by special events or activities in some field
period of time: an amount of time

Other hypernyms of season include period, time period.

season (noun)	period of time (noun)
one of the natural periods into which the year is divided by the equinoxes and solstices or atmospheric conditions	an amount of time
a recurrent time marked by major holidays
a period of the year marked by special events or activities in some field

season (verb)	period of time (verb)
make healthy
make more temperate, acceptable, or suitable by adding something else
lend flavor to