grama vs gramma

grama and gramma both are nouns.

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

As nouns, grama and gramma are synonyms defined as:

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

Other synonyms of grama include grama grass, gramma grass.

grama (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