Pinus banksiana vs pine tree

Pinus banksiana and pine tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pinus banksiana	Yes	No	No	No
pine tree	Yes	No	No	No

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

Pinus banksiana: slender medium-sized two-needled pine of eastern North America; with yellow-green needles and scaly grey to red-brown fissured bark
pine tree: a coniferous tree

Other hypernyms of Pinus banksiana include pine, true pine.

Pinus banksiana (noun)	pine tree (noun)
slender medium-sized two-needled pine of eastern North America; with yellow-green needles and scaly grey to red-brown fissured bark	a coniferous tree