NB vs nota bene

NB and nota bene both are nouns.

Word	Noun	Adjective	Verb	Adverb
NB	Yes	No	No	No
nota bene	Yes	No	No	No

As nouns, NB and nota bene are synonyms defined as:

NB and nota bene: a Latin phrase (or its abbreviation) used to indicate that special attention should be paid to something

Other synonyms of NB include N.B..

NB (noun)	nota bene (noun)
a Latin phrase (or its abbreviation) used to indicate that special attention should be paid to something	a Latin phrase (or its abbreviation) used to indicate that special attention should be paid to something