Pinus taeda vs pine tree

Pinus taeda and pine tree both are nouns.

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

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

Pinus taeda: tall spreading three-needled pine of southeastern United States having reddish-brown fissured bark and a full bushy upper head
pine tree: a coniferous tree

Other hypernyms of Pinus taeda include pine, true pine.

Pinus taeda (noun)	pine tree (noun)
tall spreading three-needled pine of southeastern United States having reddish-brown fissured bark and a full bushy upper head	a coniferous tree