Scotch pine vs Scots pine

Scotch pine and Scots pine both are nouns.

Word	Noun	Adjective	Verb	Adverb
Scotch pine	Yes	No	No	No
Scots pine	Yes	No	No	No

As nouns, Scotch pine and Scots pine are synonyms defined as:

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

Other synonyms of Scotch pine include Pinus sylvestris, Scotch fir.

Scotch pine (noun)	Scots pine (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