Japanese red pine vs pine tree

Japanese red pine and pine tree both are nouns.

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

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

Japanese red pine: pine native to Japan and Korea having a wide-spreading irregular crown when mature; grown as an ornamental
pine tree: a coniferous tree

Other hypernyms of Japanese red pine include pine, true pine.

Japanese red pine (noun)	pine tree (noun)
pine native to Japan and Korea having a wide-spreading irregular crown when mature; grown as an ornamental	a coniferous tree