British spelling vs overemphasise

British spelling is a noun but overemphasise is not a noun.

Word	Noun	Adjective	Verb	Adverb
British spelling	Yes	No	No	No
overemphasise	No	No	Yes	No

British spelling (noun)	overemphasise (noun)
English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')

British spelling (verb)	overemphasise (verb)
	place special or excessive emphasis on