Word of the Day - pseudonym

pseudonym

/ˈsjuːdənɪm/ [sue-dough-nim]
noun
A fictitious name, especially one used by an author.

Origin
Early 19th century from French pseudonyme, from Greek pseudōnymos, from pseudēs ‘false’ + onuma ‘name’.

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Frank made a modest living selling barn burner romance novels using the pseudonym, Sue Downing. Nobody cared.

[This word is a substitute for the Lexico suggestion contronym
which we have examined before. It made me think about the multitude of
"-nym" words we have in English. I wonder how many there are?]

• synonym
• antonym
• pseudonym
• contronym

The floodgates are open. Let the deluge of answers begin.