buffalo grass vs St. Augustine grass

buffalo grass and St. Augustine grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
buffalo grass	Yes	No	No	No
St. Augustine grass	Yes	No	No	No

As nouns, buffalo grass and St. Augustine grass are synonyms defined as:

buffalo grass and St. Augustine grass: low mat-forming grass of southern United States and tropical America; grown as a lawn grass

Other synonyms of buffalo grass include Stenotaphrum secundatum.

buffalo grass (noun)	St. Augustine grass (noun)
short grass growing on dry plains of central United States (where buffalo roam)	low mat-forming grass of southern United States and tropical America; grown as a lawn grass
low mat-forming grass of southern United States and tropical America; grown as a lawn grass