Sierra redwood vs Sequoia gigantea

Sierra redwood and Sequoia gigantea both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sierra redwood	Yes	No	No	No
Sequoia gigantea	Yes	No	No	No

As nouns, Sierra redwood and Sequoia gigantea are synonyms defined as:

Sierra redwood and Sequoia gigantea: extremely lofty evergreen of southern end of western foothills of Sierra Nevada in California; largest living organism

Other synonyms of Sierra redwood include big tree, giant sequoia, Sequoia Wellingtonia, Sequoiadendron giganteum.

Sierra redwood (noun)	Sequoia gigantea (noun)
extremely lofty evergreen of southern end of western foothills of Sierra Nevada in California; largest living organism	extremely lofty evergreen of southern end of western foothills of Sierra Nevada in California; largest living organism