Japanese lawn grass vs Zoysia japonica

Japanese lawn grass and Zoysia japonica both are nouns.

Word	Noun	Adjective	Verb	Adverb
Japanese lawn grass	Yes	No	No	No
Zoysia japonica	Yes	No	No	No

As nouns, Japanese lawn grass and Zoysia japonica are synonyms defined as:

Japanese lawn grass and Zoysia japonica: lawn grass common in China and Japan; grown also in United States

Other synonyms of Japanese lawn grass include Korean lawn grass.

Japanese lawn grass (noun)	Zoysia japonica (noun)
lawn grass common in China and Japan; grown also in United States	lawn grass common in China and Japan; grown also in United States