Pinus serotina vs true pine

Pinus serotina and true pine both are nouns.

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

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

Pinus serotina: large three-needled pine of sandy swamps of southeastern United States; needles longer than those of the northern pitch pine
true pine: a coniferous tree

Other hypernyms of Pinus serotina include pine, pine tree.

Pinus serotina (noun)	true pine (noun)
large three-needled pine of sandy swamps of southeastern United States; needles longer than those of the northern pitch pine	a coniferous tree