HCG vs human chorionic gonadotropin

HCG and human chorionic gonadotropin both are nouns.

Word	Noun	Adjective	Verb	Adverb
HCG	Yes	No	No	No
human chorionic gonadotropin	Yes	No	No	No

As nouns, HCG and human chorionic gonadotropin are synonyms defined as:

HCG and human chorionic gonadotropin: hormone produced early in pregnancy by the placenta; detection in the urine and serum is the basis for one kind of pregnancy test

Other synonyms of HCG include human chorionic gonadotrophin.

HCG (noun)	human chorionic gonadotropin (noun)
hormone produced early in pregnancy by the placenta; detection in the urine and serum is the basis for one kind of pregnancy test	hormone produced early in pregnancy by the placenta; detection in the urine and serum is the basis for one kind of pregnancy test