Diplotaxis (can refer both to the genus and specific species), native to the western Mediterranean and adjoining regions, used as a leaf vegetable.

Alternative form of wallflower

Alternative form of wallflower

simple past tense and past participle of brick wall

A wall in a room which has a style distinctly different from the other walls.

retaining wall

(usually capitalized) A collection of the worst or most hated entries in a particular subject, medium, field, or people who have failed to complete a challenge, etc.

A "wall" of overlapping shields formed by medieval soldiers standing next to each other

(Judaism, possibly offensive) The Western Wall.

(Judaism) An ancient wall on the western side of the Temple Mount in Jerusalem, remnant of the Jewish Second Temple. It is the holiest site in Judaism.