stone pine vs pine tree

stone pine and pine tree both are nouns.

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

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

stone pine: medium-sized two-needled pine of southern Europe having a spreading crown; widely cultivated for its sweet seeds that resemble almonds
pine tree: a coniferous tree

Other hypernyms of stone pine include pine, true pine.

stone pine (noun)	pine tree (noun)
medium-sized two-needled pine of southern Europe having a spreading crown; widely cultivated for its sweet seeds that resemble almonds	a coniferous tree