white cedar vs Atlantic white cedar

white cedar and Atlantic white cedar both are nouns.

Word	Noun	Adjective	Verb	Adverb
white cedar	Yes	No	No	No
Atlantic white cedar	Yes	No	No	No

As nouns, white cedar and Atlantic white cedar are synonyms defined as:

white cedar and Atlantic white cedar: slow-growing medium-sized cedar of east coast of the United States; resembles American arborvitae

Other synonyms of white cedar include Chamaecyparis thyoides, coast white cedar, southern white cedar, white cypress.

white cedar (noun)	Atlantic white cedar (noun)
slow-growing medium-sized cedar of east coast of the United States; resembles American arborvitae	slow-growing medium-sized cedar of east coast of the United States; resembles American arborvitae
small evergreen of eastern North America having tiny scalelike leaves on flattened branchlets