kilogram vs kg

kilogram and kg both are nouns.

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

As nouns, kilogram and kg are synonyms defined as:

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

Other synonyms of kilogram include kilo.

kilogram (noun)	kg (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