gynecology vs American spelling

gynecology and American spelling both are nouns.

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

gynecology (noun)	American spelling (noun)
the branch of medicine that deals with the diseases and hygiene of women	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')