nanometer vs nm

nanometer and nm both are nouns.

Word	Noun	Adjective	Verb	Adverb
nanometer	Yes	No	No	No
nm	Yes	No	No	No

As nouns, nanometer and nm are synonyms defined as:

Other synonyms of nanometer include micromillimeter, micromillimetre, millimicron, nanometre.

nanometer (noun)	nm (noun)
a metric unit of length equal to one billionth of a meter	a metric unit of length equal to one billionth of a meter