Douglas fir and Oregon pine

Douglas fir noun - Tall evergreen timber tree of western North America having resinous wood and short needles.

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

Oregon pine noun - Lofty douglas fir of northwestern North America having short needles and egg-shaped cones.

Douglas fir and Oregon pine are semantically related. You can use "Douglas fir" instead a noun phrase "Oregon pine".