tupping season vs mating season

tupping season and mating season both are nouns.

Word	Noun	Adjective	Verb	Adverb
tupping season	Yes	No	No	No
mating season	Yes	No	No	No

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

tupping season: a breeding season for sheep, usually in the autumn.
mating season: The breeding season is the most suitable season, usually with favourable conditions and abundant food and water, for breeding.

Other hypernyms of tupping season include breeding season.

tupping season (noun)	mating season (noun)
a breeding season for sheep, usually in the autumn.	The breeding season is the most suitable season, usually with favourable conditions and abundant food and water, for breeding.