dioptre vs Canadian spelling

dioptre and Canadian spelling both are nouns.

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

dioptre (noun)	Canadian spelling (noun)
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	English orthography used in Canada (characterized by 'analyze', 'centre', 'useable')