harden vs season

harden is not a noun while season is a noun.

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

As verbs, harden and season are synonyms defined as:

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

harden (verb)	season (verb)
become hard or harder	make healthy
make hard or harder	make more temperate, acceptable, or suitable by adding something else
make healthy	lend flavor to
cause to accept or become hardened to; habituate
harden by reheating and cooling in oil