red pine vs pine tree

red pine and pine tree both are nouns.

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

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

red pine: pine of eastern North America having long needles in bunches of two and reddish bark
pine tree: a coniferous tree

Other hypernyms of red pine include pine, true pine.

red pine (noun)	pine tree (noun)
pine of eastern North America having long needles in bunches of two and reddish bark	a coniferous tree
tall New Zealand timber tree