American arborvitae vs northern white cedar

American arborvitae and northern white cedar both are nouns.

Word	Noun	Adjective	Verb	Adverb
American arborvitae	Yes	No	No	No
northern white cedar	Yes	No	No	No

As nouns, American arborvitae and northern white cedar are synonyms defined as:

American arborvitae and northern white cedar: small evergreen of eastern North America having tiny scalelike leaves on flattened branchlets

Other synonyms of American arborvitae include Thuja occidentalis, white cedar.

American arborvitae (noun)	northern white cedar (noun)
small evergreen of eastern North America having tiny scalelike leaves on flattened branchlets	small evergreen of eastern North America having tiny scalelike leaves on flattened branchlets