Pine tree and Scotch fir

Pine tree noun - A coniferous tree.

Scotch fir and pine tree are semantically related. In some cases you can replace phrase "Scotch fir" with "Pine tree", this phrases are similar.

Scotch fir noun - Medium large two-needled pine of northern Europe and Asia having flaking red-brown bark.

Pine tree and Scotch fir are semantically related. You can use "Pine tree" instead a noun phrase "Scotch fir".