hickory pine vs Pinus pungens

hickory pine and Pinus pungens both are nouns.

Word	Noun	Adjective	Verb	Adverb
hickory pine	Yes	No	No	No
Pinus pungens	Yes	No	No	No

As nouns, hickory pine and Pinus pungens are synonyms defined as:

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

Other synonyms of hickory pine include prickly pine, table-mountain pine.

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