grama grass vs gramma

grama grass and gramma both are nouns.

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

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

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

Other synonyms of grama grass include grama, gramma grass.

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