specialist vs medico

specialist and medico both are nouns.

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

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

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

specialist (noun)	medico (noun)
an expert who is devoted to one occupation or branch of learning	a licensed medical practitioner
practices one branch of medicine	a student in medical school