Pinus contorta vs pine tree

Pinus contorta and pine tree both are nouns.

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

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

Pinus contorta: shrubby two-needled pine of coastal northwestern United States; red to yellow-brown bark fissured into small squares
pine tree: a coniferous tree

Other hypernyms of Pinus contorta include pine, true pine.

Pinus contorta (noun)	pine tree (noun)
shrubby two-needled pine of coastal northwestern United States; red to yellow-brown bark fissured into small squares	a coniferous tree