hubbard squash vs winter squash

hubbard squash and winter squash both are nouns.

Word	Noun	Adjective	Verb	Adverb
hubbard squash	Yes	No	No	No
winter squash	Yes	No	No	No

As nouns, winter squash is a hypernym of hubbard squash; that is, winter squash is a word with a broader meaning than hubbard squash:

hubbard squash: large football-shaped winter squash with a warty grey-green rind
winter squash: any of various fruits of the gourd family with thick rinds and edible yellow to orange flesh that mature in the fall and can be stored for several months

As nouns, winter squash is a hypernym of hubbard squash; that is, winter squash is a word with a broader meaning than hubbard squash:

hubbard squash: any of several winter squash plants producing large greyish-green football-shaped fruit with a rough warty rind
winter squash: any of various plants of the species Cucurbita maxima and Cucurbita moschata producing squashes that have hard rinds and mature in the fall

Other hypernyms of hubbard squash include winter squash plant.

hubbard squash (noun)	winter squash (noun)
large football-shaped winter squash with a warty grey-green rind	any of various fruits of the gourd family with thick rinds and edible yellow to orange flesh that mature in the fall and can be stored for several months
any of several winter squash plants producing large greyish-green football-shaped fruit with a rough warty rind	any of various plants of the species Cucurbita maxima and Cucurbita moschata producing squashes that have hard rinds and mature in the fall