Sequoiadendron vs plant genus

Sequoiadendron and plant genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sequoiadendron	Yes	No	No	No
plant genus	Yes	No	No	No

As nouns, plant genus is a hypernym of Sequoiadendron; that is, plant genus is a word with a broader meaning than Sequoiadendron:

Sequoiadendron: giant sequoias; sometimes included in the genus Sequoia; until recently placed in the Taxodiaceae
plant genus: a genus of plants

Sequoiadendron (noun)	plant genus (noun)
giant sequoias; sometimes included in the genus Sequoia; until recently placed in the Taxodiaceae	a genus of plants