Cedrus atlantica vs cedar

Cedrus atlantica and cedar both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cedrus atlantica	Yes	No	No	No
cedar	Yes	No	No	No

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

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

Other hypernyms of Cedrus atlantica include cedar tree, true cedar.

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