Mononym vs. Pseudonym — What's the Difference?

A single name by which a person, thing, etc., is known.

A pseudonym () (originally: ψευδώνυμος in Greek) or alias () is a fictitious name that a person or group assumes for a particular purpose, which differs from their original or true name (orthonym). This also differs from a new name that entirely or legally replaces an individual's own.

A single term for a thing or concept, allowing for no synonyms.

A fictitious name, especially a pen name.

A fictitious name (more literally, a false name), as those used by writers and movie stars.

A fictitious name assumed for the time, as by an author; a pen name; an alias.

A fictitious name used when the person performs a particular social role