The difference between Cognomen and Nickname
When used as nouns, cognomen means surname, whereas nickname means a familiar, invented given name for a person or thing used instead of the actual name of the person or thing.
Nickname is also verb with the meaning: to give a nickname to (a person or thing).
check bellow for the other definitions of Cognomen and Nickname
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Cognomen as a noun:
surname
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Cognomen as a noun (historical):
the third part of the name of a citizen of ancient Rome
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Cognomen as a noun:
a nickname or epithet by which someone is identified; a byname; a moniker or sobriquet
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Nickname as a noun:
A familiar, invented given name for a person or thing used instead of the actual name of the person or thing.
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Nickname as a noun:
A kind of byname that describes a person by a characteristic of that person.
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Nickname as a verb (transitive):
To give a nickname to (a person or thing).