Mental faculty is a term used to describe various aspects of the brain that enable us to perceive, reason, and remember. There are several synonyms for this term such as intellect, cognition, mental capacity, and cognitive function. The intellect refers to a person's ability to think and reason, while cognition refers to the process of gaining knowledge through thought, experience, and the senses. Mental capacity is a term used to describe the ability of the brain to process information, while cognitive function refers to the brain's ability to perform specific tasks such as memory, attention, language, and perception. These synonyms can be used interchangeably to describe the various functions of the human brain.