Cedrus atlantica vs cedar tree

Cedrus atlantica and cedar tree both are nouns.

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

As nouns, cedar tree is a hypernym of Cedrus atlantica; that is, cedar tree 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 tree: any cedar of the genus Cedrus

Other hypernyms of Cedrus atlantica include cedar, true cedar.

Cedrus atlantica (noun)	cedar tree (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