NB vs N.B.

NB and N.B. both are nouns.

Word	Noun	Adjective	Verb	Adverb
NB	Yes	No	No	No
N.B.	Yes	No	No	No

As nouns, NB and N.B. are synonyms defined as:

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

Other synonyms of NB include nota bene.

NB (noun)	N.B. (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