gram vs gramme

gram and gramme both are nouns.

Word	Noun	Adjective	Verb	Adverb
gram	Yes	No	No	No
gramme	Yes	No	No	No

As nouns, gram and gramme are synonyms defined as:

gram and gramme: a metric unit of weight equal to one thousandth of a kilogram

Other synonyms of gram include g, gm.

gram (noun)	gramme (noun)
a metric unit of weight equal to one thousandth of a kilogram	a metric unit of weight equal to one thousandth of a kilogram