Pinus rigida vs true pine

Pinus rigida and true pine both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pinus rigida	Yes	No	No	No
true pine	Yes	No	No	No

As nouns, true pine is a hypernym of Pinus rigida; that is, true pine is a word with a broader meaning than Pinus rigida:

Pinus rigida: large three-needled pine of the eastern United States and southeastern Canada; closely related to the pond pine
true pine: a coniferous tree

Other hypernyms of Pinus rigida include pine, pine tree.

Pinus rigida (noun)	true pine (noun)
large three-needled pine of the eastern United States and southeastern Canada; closely related to the pond pine	a coniferous tree