cedar vs red cedar

cedar and red cedar both are nouns.

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

As nouns, red cedar is a hyponym of cedar; that is, red cedar is a word with a more specific, narrower meaning than cedar:

cedar: any of numerous trees of the family Cupressaceae that resemble cedars
red cedar: tall tree of the Pacific coast of North America having foliage like cypress and cinnamon-red bark

As nouns, red cedar is a hyponym of cedar; that is, red cedar is a word with a more specific, narrower meaning than cedar:

cedar: durable aromatic wood of any of numerous cedar trees; especially wood of the red cedar often used for cedar chests
red cedar: fragrant reddish wood of any of various red cedar trees

Other hyponyms of cedar include Port Orford cedar.

cedar (noun)	red cedar (noun)
any cedar of the genus Cedrus	tall tree of the Pacific coast of North America having foliage like cypress and cinnamon-red bark
any of numerous trees of the family Cupressaceae that resemble cedars	small juniper found east of Rocky Mountains having a conic crown, brown bark that peels in shreds, and small sharp needles
durable aromatic wood of any of numerous cedar trees; especially wood of the red cedar often used for cedar chests	large valuable arborvitae of northwestern United States
	fragrant reddish wood of any of various red cedar trees