storm center vs American spelling

storm center and American spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
storm center	Yes	No	No	No
American spelling	Yes	No	No	No

storm center (noun)	American spelling (noun)
the central area or place of lowest barometric pressure within a storm	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')
a center of trouble or disturbance