rationalise vs British spelling

rationalise is not a noun while British spelling is a noun.

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

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

rationalise (verb)	British spelling (verb)
weed out unwanted or unnecessary things
remove irrational quantities from
think rationally; employ logic or reason
defend, explain, clear away, or make excuses for by reasoning
structure and run according to rational or scientific principles in order to achieve desired results