1) a game in which a large bowl is rolled across grass (bowls)

2) a tube-shaped object, usually part of a machine, used for pressing, smoothing, crushing etc; a tube-shaped piece placed under an object to make movement easy, or round which something may be rolled easily (roller)

3) a lump of soft material used to keep things apart or in place, or to stop up a hole; a collection (of banknotes, documents etc) folded or rolled together (wad)