Pinus radiata vs pine tree

Pinus radiata and pine tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pinus radiata	Yes	No	No	No
pine tree	Yes	No	No	No

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

Pinus radiata: tall California pine with long needles in bunches of 3, a dense crown, and dark brown deeply fissured bark
pine tree: a coniferous tree

Other hypernyms of Pinus radiata include pine, true pine.

Pinus radiata (noun)	pine tree (noun)
tall California pine with long needles in bunches of 3, a dense crown, and dark brown deeply fissured bark	a coniferous tree