Rock

noun

1. A formation of minerals, specifically:
2. A large hill or island having no vegetation.

   "Pearl Rock near Cape Cod is so named because the morning sun makes it gleam like a pearl."

3. Something that is strong, stable, and dependable; a person who provides security or support to another.
4. A lump or cube of ice.

   "I'll have a whisky on the rocks, please."

5. A type of confectionery made from sugar in the shape of a stick, traditionally having some text running through its length.

   "While we're in Brighton, let's get a stick of rock!"