arolla pine vs pine tree

arolla pine and pine tree both are nouns.

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

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

arolla pine: large five-needled European pine; yields cembra nuts and a resinous exudate
pine tree: a coniferous tree

Other hypernyms of arolla pine include pine, true pine.

arolla pine (noun)	pine tree (noun)
large five-needled European pine; yields cembra nuts and a resinous exudate	a coniferous tree