Englishfor English speakers
specialist
Noun
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A specialist is a person who is highly skilled in one type of activity or study.
His army training had made him a bomb disposal specialist.
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A specialist is a doctor who is skilled in treating one part of the body.
It hurt so much when she swallowed food that she was sent to a throat specialist.
dictionary
Noun
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A dictionary is a book that tells you what words mean, and how to spell them. A lot of dictionaries will also tell you about etymology (where words come from) and pronunciation (how to speak them).
You are reading an online dictionary right now.
The words in a printed dictionary are in alphabetical order.
I looked up the dictionary to find the meaning of the word business.