care for vs nurse

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

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

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

care for (noun)	nurse (noun)
	one skilled in caring for young children or the sick (usually under the supervision of a physician)
	a woman who is the custodian of children

care for (verb)	nurse (verb)
provide treatment for	try to cure by special care of treatment, of an illness or injury
have a liking, fondness, or taste (for)	give suck to
be fond of; be attached to	maintain (a theory, thoughts, or feelings)
	serve as a nurse; care for sick or handicapped people
	treat carefully