breastfeed vs nurse

breastfeed is not a noun while nurse is a noun.

Word	Noun	Adjective	Verb	Adverb
breastfeed	No	No	Yes	No
nurse	Yes	No	Yes	No

As verbs, breastfeed and nurse are synonyms defined as:

Other synonyms of breastfeed include give suck, lactate, suck, suckle, wet-nurse.

breastfeed (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

breastfeed (verb)	nurse (verb)
give suck to	try to cure by special care of treatment, of an illness or injury
	give suck to
	maintain (a theory, thoughts, or feelings)
	serve as a nurse; care for sick or handicapped people
	treat carefully