Pinus glabra vs true pine

Pinus glabra and true pine both are nouns.

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

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

Pinus glabra: large two-needled pine of southeastern United States with light soft wood
true pine: a coniferous tree

Other hypernyms of Pinus glabra include pine, pine tree.

Pinus glabra (noun)	true pine (noun)
large two-needled pine of southeastern United States with light soft wood	a coniferous tree