Sequoiadendron giganteum vs big tree

Sequoiadendron giganteum and big tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sequoiadendron giganteum	Yes	No	No	No
big tree	Yes	No	No	No

As nouns, Sequoiadendron giganteum and big tree are synonyms defined as:

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

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

Sequoiadendron giganteum (noun)	big tree (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