Canadian spelling vs dioptre

Canadian spelling and dioptre both are nouns.

Word	Noun	Adjective	Verb	Adverb
Canadian spelling	Yes	No	No	No
dioptre	Yes	No	No	No

Canadian spelling (noun)	dioptre (noun)
English orthography used in Canada (characterized by 'analyze', 'centre', 'useable')	a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters; used by oculists