coast white cedar vs cedar tree

coast white cedar and cedar tree both are nouns.

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

As nouns, cedar tree is a hypernym of coast white cedar; that is, cedar tree is a word with a broader meaning than coast white cedar:

coast white cedar: slow-growing medium-sized cedar of east coast of the United States; resembles American arborvitae
cedar tree: any of numerous trees of the family Cupressaceae that resemble cedars

Other hypernyms of coast white cedar include cedar.

coast white cedar (noun)	cedar tree (noun)
slow-growing medium-sized cedar of east coast of the United States; resembles American arborvitae	any cedar of the genus Cedrus
	any of numerous trees of the family Cupressaceae that resemble cedars