Hickory pine and Pine tree

Hickory pine noun - A small two-needled upland pine of the eastern United States (Appalachians) having dark brown flaking bark and thorn-tipped cone scales.

Pine tree and hickory pine are semantically related. In some cases you can use "Pine tree" instead a noun phrase "Hickory pine".

Pine tree noun - A coniferous tree.

Hickory pine and pine tree are semantically related. Sometimes you can replace phrase "Hickory pine" with "Pine tree", this phrases are similar.