universal meter vs American spelling

universal meter and American spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
universal meter	Yes	No	No	No
American spelling	Yes	No	No	No

universal meter (noun)	American spelling (noun)
a unit of length equivalent to the length of a free seconds pendulum; differs from the modern metre by half a centimetre, introduced by Tito Livio Burattini in 1675.	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')