micromillimetre vs nm

micromillimetre and nm both are nouns.

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

As nouns, micromillimetre and nm are synonyms defined as:

micromillimetre and nm: a metric unit of length equal to one billionth of a meter

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

micromillimetre (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