Word Study
nom de plume
OXFORD DICTIONARY
nom de plume, n. (pl. noms de plume pronunc. same) an assumed name under which a person writes.
Etymology
formed in E of F words, = pen-name, after NOM DE GUERRE
ROGET THESAURUS
nom de plume
Misnomer
N misnomer, lucus a non lucendo, Mrs, Malaprop, what d'ye call 'em, Hoosier, nickname, sobriquet, by-name, assumed name, assumed title, alias, nom de course, nom de theatre, nom de guerre, nom de plume, pseudonym, pseudonymy, misnamed, pseudonymous, soi-disant, self called, self styled, self christened, so-called, nameless, anonymous, without a having no name, innominate, unnamed, unacknowledged, in no sense.For further exploring for "nom de plume" in Webster Dictionary Online