grama vs gramma grass

grama and gramma grass both are nouns.

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

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

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

Other synonyms of grama include grama grass, gramma.

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