Australian spelling vs program optimisation

Australian spelling and program optimisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
Australian spelling	Yes	No	No	No
program optimisation	Yes	No	No	No

Australian spelling (noun)	program optimisation (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')	the process of modifying a software system to make some aspect of it work more efficiently or use fewer resources.