season vs Advent

season and Advent both are nouns.

Word	Noun	Adjective	Verb	Adverb
season	Yes	No	Yes	No
Advent	Yes	No	No	No

As nouns, Advent is a hyponym of season; that is, Advent is a word with a more specific, narrower meaning than season:

season (noun)	Advent (noun)
one of the natural periods into which the year is divided by the equinoxes and solstices or atmospheric conditions	(Christian theology) the reappearance of Jesus as judge for the Last Judgment
a recurrent time marked by major holidays	the season including the four Sundays preceding Christmas
a period of the year marked by special events or activities in some field

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