A fictitious name, especially one used by an author.
Early 19th century from French pseudonyme, from Greek pseudōnymos, from pseudēs ‘false’ + onuma ‘name’.
Frank made a modest living selling barn burner romance novels using the pseudonym, Sue Downing. Nobody cared.
"Pseudonym" 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?
The floodgates are open. Let the deluge of answers begin.
I'm surprised I haven't seen #mononym mentioned yet. Especially since registration forms often assume that people have a first name and last name, making it rather difficult for them to register with their preferred or even actual name.
(This was a major issue in the early days of #GooglePlus for instance, which made #nymwars a rather trending topic.)
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