American spelling vs micrometer

American spelling and micrometer both are nouns.

Word	Noun	Adjective	Verb	Adverb
American spelling	Yes	No	No	No
micrometer	Yes	No	No	No

American spelling (noun)	micrometer (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	a metric unit of length equal to one millionth of a meter
	caliper for measuring small distances