kg vs kilogram

kg and kilogram both are nouns.

Word	Noun	Adjective	Verb	Adverb
kg	Yes	No	No	No
kilogram	Yes	No	No	No

As nouns, kg and kilogram are synonyms defined as:

kg and kilogram: one thousand grams; the basic unit of mass adopted under the Systeme International d'Unites

Other synonyms of kg include kilo.

kg (noun)	kilogram (noun)
one thousand grams; the basic unit of mass adopted under the Systeme International d'Unites	one thousand grams; the basic unit of mass adopted under the Systeme International d'Unites