kilogram vs kilo

kilogram and kilo both are nouns.

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

As nouns, kilogram and kilo are synonyms defined as:

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

Other synonyms of kilogram include kg.

kilogram (noun)	kilo (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