American spelling vs program optimization

American spelling and program optimization both are nouns.

Word	Noun	Adjective	Verb	Adverb
American spelling	Yes	No	No	No
program optimization	Yes	No	No	No

American spelling (noun)	program optimization (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	the process of modifying a software system to make some aspect of it work more efficiently or use fewer resources.