red cedar vs western red cedar

red cedar and western red cedar both are nouns.

Word	Noun	Adjective	Verb	Adverb
red cedar	Yes	No	No	No
western red cedar	Yes	No	No	No

As nouns, red cedar and western red cedar are synonyms defined as:

red cedar and western red cedar: large valuable arborvitae of northwestern United States

Other synonyms of red cedar include canoe cedar, Thuja plicata.

red cedar (noun)	western red cedar (noun)
tall tree of the Pacific coast of North America having foliage like cypress and cinnamon-red bark	large valuable arborvitae of northwestern United States
small juniper found east of Rocky Mountains having a conic crown, brown bark that peels in shreds, and small sharp needles
large valuable arborvitae of northwestern United States
fragrant reddish wood of any of various red cedar trees