gastroenterologist vs medico

gastroenterologist and medico both are nouns.

Word	Noun	Adjective	Verb	Adverb
gastroenterologist	Yes	No	No	No
medico	Yes	No	No	No

As nouns, medico is a hypernym of gastroenterologist; that is, medico is a word with a broader meaning than gastroenterologist:

gastroenterologist: a physician who specializes in diseases of the gastrointestinal tract
medico: a licensed medical practitioner

Other hypernyms of gastroenterologist include doc, doctor, Dr., MD, physician.

gastroenterologist (noun)	medico (noun)
a physician who specializes in diseases of the gastrointestinal tract	a licensed medical practitioner
	a student in medical school