Cycladic civilization vs American spelling

Cycladic civilization and American spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cycladic civilization	Yes	No	No	No
American spelling	Yes	No	No	No

Cycladic civilization (noun)	American spelling (noun)
the Bronze Age civilization on the Cyclades islands in the southern Aegean Sea that flourished 3000-1100 BC	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')