self-fertilisation vs British spelling

self-fertilisation and British spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
self-fertilisation	Yes	No	No	No
British spelling	Yes	No	No	No

self-fertilisation (noun)	British spelling (noun)
fertilization by the union of male and female gametes from the same individual	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')