notation vs N.B.

notation and N.B. both are nouns.

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

As nouns, N.B. is a hyponym of notation; that is, N.B. is a word with a more specific, narrower meaning than notation:

notation: a comment or instruction (usually added)
N.B.: a Latin phrase (or its abbreviation) used to indicate that special attention should be paid to something

notation (noun)	N.B. (noun)
the activity of representing something by a special system of marks or characters	a Latin phrase (or its abbreviation) used to indicate that special attention should be paid to something
a technical system of symbols used to represent special things
a comment or instruction (usually added)