Monterey pine vs pine tree

Monterey pine and pine tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Monterey pine	Yes	No	No	No
pine tree	Yes	No	No	No

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

Monterey pine: tall California pine with long needles in bunches of 3, a dense crown, and dark brown deeply fissured bark
pine tree: a coniferous tree

Other hypernyms of Monterey pine include pine, true pine.

Monterey pine (noun)	pine tree (noun)
tall California pine with long needles in bunches of 3, a dense crown, and dark brown deeply fissured bark	a coniferous tree