Sequoiadendron giganteum vs Sequoia gigantea

Sequoiadendron giganteum and Sequoia gigantea both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sequoiadendron giganteum	Yes	No	No	No
Sequoia gigantea	Yes	No	No	No

As nouns, Sequoiadendron giganteum and Sequoia gigantea are synonyms defined as:

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

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

Sequoiadendron giganteum (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