American spelling vs metricize

American spelling is a noun but metricize is not a noun.

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

American spelling (noun)	metricize (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')

American spelling (verb)	metricize (verb)
	convert from a non-metric to the metric system
	express in the metric system