Zoysia matrella vs zoysia

Zoysia matrella and zoysia both are nouns.

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

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

Zoysia matrella: lawn grass common in the Philippines; grown also in United States
zoysia: any of several creeping grasses of the genus Zoysia

Zoysia matrella (noun)	zoysia (noun)
lawn grass common in the Philippines; grown also in United States	any of several creeping grasses of the genus Zoysia