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: The human brain is an incredible pattern-matching machine.
Genius
Part of speech: noun
Definition: Someone possessing extraordinary intelligence or skill; especially somebody who has demonstrated this by a creative or original work in science, music, art etc.Extraordinary mental capacity.inspiration, a mental leap, an extraordinary creative process.The guardian spirit of a place or person.A way of thinking, optimizing one's capacity for learning and understanding.
Example sentence: Every positive value has its price in negative terms... the genius of Einstein leads to Hiroshima.