alias
The word 'alias' in Spanish has the same meaning as in English. It is often used in formal and legal contexts to indicate an additional name that a person (such as a criminal) might be known by. In casual use, it can refer to a nickname or pseudonym that a person may use online or in other informal settings. The pronunciation is also similar in both languages, although in Spanish the 'a' has a sharper 'ah' sound and the 's' at the end is pronounced.
She uses an alias to protect her identity.
This phrase indicates that the person uses a different name to keep her real identity secret.
The writer published his novel under a famous alias.
This sentence means that the writer chose a well-known name to publish his work, possibly to gain more recognition or to separate their personal and professional lives.
He uses an alias online to maintain his privacy.
This illustrates that the person employs a different name on the internet to avoid revealing their true identity.