Dictionaries usually treat nom de plume as synonymous with 'pen name' or 'pseudonym'. Example from Merriam Webster's dictionary:
Definition of nom de plume: a name that a writer uses instead of his or her real name : PSEUDONYM, PEN NAME
In what context would you use one rather than the other? Is it a matter of regional preferences (ex. one is more prevalent in Britain and the other in America)?
Best Answer
A pseudonym is any time you are using a name other than your own.
A pen name is when an author publishes under a different name.
A nom de plume is when a pretentious author publishes under a different name.
Generally a pseudonym has the intention of concealing who the real person is. With a pen name or nom de plume it may be for purposes other than concealment.