umbrella pine vs pine tree

umbrella pine and pine tree both are nouns.

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

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

umbrella 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 umbrella pine include pine, true pine.

umbrella 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