nanometre vs nm

nanometre and nm both are nouns.

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

As nouns, nanometre and nm are synonyms defined as:

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

nanometre (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