British spelling vs concentre

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

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

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

British spelling (verb)	concentre (verb)
	bring into focus or alignment; to converge or cause to converge; of ideas or emotions