g vs gramme

g and gramme both are nouns.

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

As nouns, g and gramme are synonyms defined as:

Other synonyms of g include gm, gram.

g (noun)	gramme (noun)
the 7th letter of the Roman alphabet	a metric unit of weight equal to one thousandth of a kilogram
a metric unit of weight equal to one thousandth of a kilogram
a unit of force equal to the force exerted by gravity; used to indicate the force to which a body is subjected when it is accelerated