American arborvitae vs Thuja occidentalis

American arborvitae and Thuja occidentalis both are nouns.

Word	Noun	Adjective	Verb	Adverb
American arborvitae	Yes	No	No	No
Thuja occidentalis	Yes	No	No	No

As nouns, American arborvitae and Thuja occidentalis are synonyms defined as:

American arborvitae and Thuja occidentalis: small evergreen of eastern North America having tiny scalelike leaves on flattened branchlets

Other synonyms of American arborvitae include northern white cedar, white cedar.

American arborvitae (noun)	Thuja occidentalis (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