A famous mountain in the Black Hills with the heads of four US presidents carved into it.

(by extension) The four most important people in a particular field or category.

An imaginary tree from which money can be plucked. See money doesn't grow on trees. / (commercial name) The Malabar chestnut, Pachira aquatica. / (botany) The jade plant, Crassula ovata.

A person who mocks. / A mockingbird. / (archaic) A deceiver; an impostor.

A member of a mob or Mafia.

(physics, classical mechanics) A measure of a rigid body's resistance to change in its angular velocity around a given axis.

Any moth of the family Sphingidae.

Containing holes by having been eaten by moth larvae. / (figuratively, by extension) Old and in poor condition.

Play money. / (slang, often derogatory) Banknotes of foreign currency; especially those which are vibrant or flimsy.

(transitive) To create a model or demonstration; to create a preliminary version or sample.