hickory pine vs true pine

hickory pine and true pine both are nouns.

Word	Noun	Adjective	Verb	Adverb
hickory pine	Yes	No	No	No
true pine	Yes	No	No	No

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

hickory pine: a small two-needled upland pine of the eastern United States (Appalachians) having dark brown flaking bark and thorn-tipped cone scales
true pine: a coniferous tree

Other hypernyms of hickory pine include pine, pine tree.

hickory pine (noun)	true pine (noun)
a small two-needled upland pine of the eastern United States (Appalachians) having dark brown flaking bark and thorn-tipped cone scales	a coniferous tree