flour dealer; flour shop
Refers to a person or shop that sells flour. Can also be used for a business that deals in flour products.
祖父は町で小さな粉屋を営んでいた。
My grandfather ran a small flour shop in town.
miller
Specifically a person who operates a mill to grind grain into flour. Less common than the dealer sense in modern Japanese.
粉屋は水車を使って小麦を挽いていた。
The miller was grinding wheat using a waterwheel.
Refers to the facility or building where grain is ground into flour. Often used in historical or rural contexts.
その村には古い粉屋がまだ残っている。
An old flour mill still remains in that village.
From 粉 “flour, powder” and 屋 “shop, dealer.” The reading こなや contains no sequential voicing.