gramma grass vs grama grass

gramma grass and grama grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
gramma grass	Yes	No	No	No
grama grass	Yes	No	No	No

As nouns, gramma grass and grama grass are synonyms defined as:

gramma grass and grama grass: pasture grass of plains of South America and western North America

Other synonyms of gramma grass include grama, gramma.

gramma grass (noun)	grama grass (noun)
pasture grass of plains of South America and western North America	pasture grass of plains of South America and western North America