orthopaedic vs British spelling

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

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

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

orthopaedic (adjective)	British spelling (adjective)
of or relating to orthopedics