razor sharpener
Refers to a person who sharpens razors professionally. A somewhat specialized occupation.
祖父は若い頃、剃刀研ぎとして働いていた。
My grandfather worked as a razor sharpener when he was young.
Compound of 剃刀 (razor) and 研ぎ (sharpening, from 研ぐ 'to sharpen').