coast white cedar vs southern white cedar

coast white cedar and southern white cedar both are nouns.

Word	Noun	Adjective	Verb	Adverb
coast white cedar	Yes	No	No	No
southern white cedar	Yes	No	No	No

As nouns, coast white cedar and southern white cedar are synonyms defined as:

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

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

coast white cedar (noun)	southern 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