/ˈsuːdənɪm/

pseudo·nym

BrE /ˈsuːdənɪm/,

also /ˈsjuːdənɪm/

NAmE /ˈsuːdənɪm/

a name used by sb, especially a writer, instead of their real name

She writes under a pseudonym.

➡  compare pen name

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pseud·onym·ous

BrE /suːˈdɒnɪməs/,

/sjuːˈdɒnɪməs/

NAmE /suːˈdɑːnɪməs/