Pinus sylvestris vs true pine

Pinus sylvestris and true pine both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pinus sylvestris	Yes	No	No	No
true pine	Yes	No	No	No

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

Pinus sylvestris: medium large two-needled pine of northern Europe and Asia having flaking red-brown bark
true pine: a coniferous tree

Other hypernyms of Pinus sylvestris include pine, pine tree.

Pinus sylvestris (noun)	true pine (noun)
medium large two-needled pine of northern Europe and Asia having flaking red-brown bark	a coniferous tree