nurse vs suckle

nurse is a noun but suckle is not a noun.

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

As verbs, nurse and suckle are synonyms defined as:

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

nurse (noun)	suckle (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

nurse (verb)	suckle (verb)
try to cure by special care of treatment, of an illness or injury	give suck to
give suck to	suck milk from the mother's breasts
maintain (a theory, thoughts, or feelings)
serve as a nurse; care for sick or handicapped people
treat carefully