書斎
しょさい · shosai · JLPT N3 · noun
survey
📚🪑 書斎 = write/book (書) + study room (斎): the room for books
書 means writing or books, as in 書く (to write) and 辞書 (dictionary). 斎 originally meant ritual purification, then a quiet secluded room. Put together: a quiet room set apart for books, which is a study or den.