Nickname vs. Pseudonym

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Difference Between Nickname and Pseudonym
Nicknamenoun
A familiar, invented given name for a person or thing used instead of the actual name of the person or thing.
Pseudonymnoun
A fictitious name, as those used by writers and movie stars.
The Reverend Charles Lutwidge Dodgson wrote "Alice's Adventures in Wonderland" under the pseudonym Lewis Carroll.Nicknamenoun
A kind of byname that describes a person by a characteristic of that person.
Pseudonymnoun
a fictitious name used when the person performs a particular social role
Nicknameverb
(transitive) To give a nickname to (a person or thing).
Nicknamenoun
a familiar name for a person (often a shortened version of a person's given name);
Joe's mother would not use his nickname and always called him JosephHenry's nickname was SlimADVERTISEMENT
Nicknamenoun
a descriptive name for a place or thing;
the nickname for the U.S. Constitution is `Old Ironsides'Nicknameverb
give a nickname to