Scotch pine vs Pinus sylvestris

Scotch pine and Pinus sylvestris both are nouns.

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

As nouns, Scotch pine and Pinus sylvestris are synonyms defined as:

Scotch pine and Pinus sylvestris: medium large two-needled pine of northern Europe and Asia having flaking red-brown bark

Other synonyms of Scotch pine include Scotch fir, Scots pine.

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