Atlas cedar vs true cedar

Atlas cedar and true cedar both are nouns.

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

As nouns, true cedar is a hypernym of Atlas cedar; that is, true cedar is a word with a broader meaning than Atlas cedar:

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

Other hypernyms of Atlas cedar include cedar, cedar tree.

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