Pinus virginiana vs true pine

Pinus virginiana and true pine both are nouns.

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

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

Pinus virginiana: common small shrubby pine of the eastern United States having straggling often twisted or branches and short needles in bunches of 2
true pine: a coniferous tree

Other hypernyms of Pinus virginiana include pine, pine tree.

Pinus virginiana (noun)	true pine (noun)
common small shrubby pine of the eastern United States having straggling often twisted or branches and short needles in bunches of 2	a coniferous tree