Zoysia tenuifolia vs zoysia

Zoysia tenuifolia and zoysia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Zoysia tenuifolia	Yes	No	No	No
zoysia	Yes	No	No	No

As nouns, zoysia is a hypernym of Zoysia tenuifolia; that is, zoysia is a word with a broader meaning than Zoysia tenuifolia:

Zoysia tenuifolia: Asiatic creeping perennial grass; introduced in southern United States as a drought-resistant lawn grass
zoysia: any of several creeping grasses of the genus Zoysia

Zoysia tenuifolia (noun)	zoysia (noun)
Asiatic creeping perennial grass; introduced in southern United States as a drought-resistant lawn grass	any of several creeping grasses of the genus Zoysia