registered nurse vs NP

registered nurse and NP both are nouns.

Word	Noun	Adjective	Verb	Adverb
registered nurse	Yes	No	No	No
NP	Yes	No	No	No

As nouns, NP is a hyponym of registered nurse; that is, NP is a word with a more specific, narrower meaning than registered nurse:

registered nurse: a graduate nurse who has passed examinations for registration
NP: a registered nurse who has received special training and can perform many of the duties of a physician

Other hyponyms of registered nurse include nurse-midwife, nurse clinician, nurse practitioner.

registered nurse (noun)	NP (noun)
a graduate nurse who has passed examinations for registration	a registered nurse who has received special training and can perform many of the duties of a physician