British spelling vs systematic desensitisation

British spelling and systematic desensitisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
British spelling	Yes	No	No	No
systematic desensitisation	Yes	No	No	No

British spelling (noun)	systematic desensitisation (noun)
English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')	a technique used in behavior therapy to treat phobias and other behavior problems involving anxiety; client is exposed to the threatening situation under relaxed conditions until the anxiety reaction is extinguished