carbo loading vs carbohydrate loading

carbo loading and carbohydrate loading both are nouns.

Word	Noun	Adjective	Verb	Adverb
carbo loading	Yes	No	No	No
carbohydrate loading	Yes	No	No	No

As nouns, carbo loading and carbohydrate loading are synonyms defined as:

carbo loading and carbohydrate loading: a diet of foods high in starch that increases carbohydrate reserves in muscles

carbo loading (noun)	carbohydrate loading (noun)
a diet of foods high in starch that increases carbohydrate reserves in muscles	a diet of foods high in starch that increases carbohydrate reserves in muscles