Englishfor English speakers
assistant
Noun
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An assistant is a person who helps (or assists) another person.
The doctor's assistant held his tools.
assistant
Adjective
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If you are assistant, you have a position under someone.
The assistant guard was in training to become a full guard.
deputy
Noun
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A deputy is somebody one level down from another person. The deputy helps the other person or does that person's job sometimes.
The sheriff posted a deputy to stay until they could get a better look in the morning.
He was Deputy Secretary and Under Secretary Paul D. Wolfowitz.
administrator
Noun
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An administrator is a person who takes authority over someone or something.
Congratulations to Max, he is now an administrator of Wiktionary!