Piece of furniture and Wall unit

Piece of furniture noun - Furnishings that make a room or other area ready for occupancy.

Wall unit and piece of furniture are semantically related. In some cases you can replace phrase "Wall unit" with "Piece of furniture", this phrases are similar.

Wall unit noun - A piece of furniture having several units that stands against one wall of a room.

Piece of furniture and wall unit are semantically related. Sometimes you can use "Piece of furniture" instead a noun phrase "Wall unit".