care for vs doctor

care for is not a noun while doctor is a noun.

Word	Noun	Adjective	Verb	Adverb
care for	No	No	Yes	No
doctor	Yes	No	Yes	No

As verbs, doctor is a hyponym of care for; that is, doctor is a word with a more specific, narrower meaning than care for:

care for (noun)	doctor (noun)
	children take the roles of physician or patient or nurse and pretend they are at the physician's office
	a licensed medical practitioner
	a person who holds Ph.D. degree (or the equivalent) from an academic institution

care for (verb)	doctor (verb)
provide treatment for	give medical treatment to
have a liking, fondness, or taste (for)	alter and make impure, as with the intention to deceive
be fond of; be attached to	restore by replacing a part or putting together what is torn or broken