jousting armour vs British spelling

jousting armour and British spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
jousting armour	Yes	No	No	No
British spelling	Yes	No	No	No

jousting armour (noun)	British spelling (noun)
a heavy plate armor not intended for free combat, produced in the late 15th to 16th century.	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')