medical man vs caregiver

medical man and caregiver both are nouns.

Word	Noun	Adjective	Verb	Adverb
medical man	Yes	No	No	No
caregiver	Yes	No	No	No

As nouns, caregiver is a hypernym of medical man; that is, caregiver is a word with a broader meaning than medical man:

medical man: someone who practices medicine
caregiver: a person who helps in identifying or preventing or treating illness or disability

Other hypernyms of medical man include health care provider, health professional, PCP, primary care provider.

medical man (noun)	caregiver (noun)
someone who practices medicine	a person who is responsible for attending to the needs of a child or dependent adult
	a person who helps in identifying or preventing or treating illness or disability