cassock vs outer rason

cassock and outer rason both are nouns.

Word	Noun	Adjective	Verb	Adverb
cassock	Yes	No	No	No
outer rason	Yes	No	No	No

As nouns, outer rason is a hyponym of cassock; that is, outer rason is a word with a more specific, narrower meaning than cassock:

cassock: a black garment reaching down to the ankles; worn by priests or choristers
outer rason: a voluminous garment worn over the inner cassock by bishops, priests, deacons, and monastics as their regular outer wear.

Other hyponyms of cassock include soutane, outer cassock, inner cassock, inner rason.

cassock (noun)	outer rason (noun)
a black garment reaching down to the ankles; worn by priests or choristers	a voluminous garment worn over the inner cassock by bishops, priests, deacons, and monastics as their regular outer wear.