gm vs gramme

gm and gramme both are nouns.

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

As nouns, gm and gramme are synonyms defined as:

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

Other synonyms of gm include g, gram.

gm (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