coast redwood vs California redwood

coast redwood and California redwood both are nouns.

Word	Noun	Adjective	Verb	Adverb
coast redwood	Yes	No	No	No
California redwood	Yes	No	No	No

As nouns, coast redwood and California redwood are synonyms defined as:

coast redwood and California redwood: lofty evergreen of United States coastal foothills from Oregon to Big Sur; it flourishes in wet, rainy, foggy habitats

Other synonyms of coast redwood include Sequoia sempervirens.

coast redwood (noun)	California redwood (noun)
lofty evergreen of United States coastal foothills from Oregon to Big Sur; it flourishes in wet, rainy, foggy habitats	lofty evergreen of United States coastal foothills from Oregon to Big Sur; it flourishes in wet, rainy, foggy habitats