micromillimeter vs nm

micromillimeter and nm both are nouns.

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

As nouns, micromillimeter and nm are synonyms defined as:

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

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

micromillimeter (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