British spelling vs endeavour

British spelling and endeavour both are nouns.

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

British spelling (noun)	endeavour (noun)
English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')	earnest and conscientious activity intended to do or accomplish something
	a purposeful or industrious undertaking (especially one that requires effort or boldness)

British spelling (verb)	endeavour (verb)
	attempt by employing effort