Brain
Part of speech: noun
Definition: The control center of the central nervous system of an animal located in the skull which is responsible for perception, cognition, attention, memory, emotion, and action. An intelligent person. A person who provides the intelligence required for something. Intellect. By analogy with a human brain, the part of a machine or computer that performs calculations.
Part of speech: verb
Definition: To strike (someone) on the head. To kill (a person) by smashing that person's skull.
Example sentence: An idea not coupled with action will never get any bigger than the brain cell it occupied.
Mastermind
Part of speech: noun
Definition: A person with an extraordinary intellect or skill that is markedly superior to his or her peers.A person responsible for the highest level of planning and execution of a major operation.
Part of speech: verb
Definition: To act in the role of mastermind.