cedar vs Atlas cedar

cedar and Atlas cedar both are nouns.

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

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

cedar: any cedar of the genus Cedrus
Atlas cedar: tall Algerian evergreen of Atlas mountains with blue-green leaves; widely planted as an ornamental

cedar (noun)	Atlas cedar (noun)
any cedar of the genus Cedrus	tall Algerian evergreen of Atlas mountains with blue-green leaves; widely planted as an ornamental
any of numerous trees of the family Cupressaceae that resemble cedars
durable aromatic wood of any of numerous cedar trees; especially wood of the red cedar often used for cedar chests