Explanation:

- A person, animal, or plant much below the usual height is typically referred to as a dwarf.

- Option 1: Wizard - A wizard is a person who practices magic. They are often depicted in stories and folklore as having great power and knowledge.

- Option 2: Dwarf - A dwarf is, indeed, a term for a person, animal, or plant that is much shorter than usual.

- Option 3: Creature - A creature is any animal or living being, and it does not necessarily imply being shorter or smaller.

- Option 4: Witch - A witch is often depicted as a person with magical powers, typically female, and doesn't suggest anything about height.