British spelling vs belabour

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

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

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

British spelling (verb)	belabour (verb)
	attack verbally with harsh criticism
	beat soundly
	to work at or to absurd length