A thesaurus is primarily used to look up synonyms--words that have similar meanings to the word you are trying to find alternatives for. It can help you find different words to use in your writing to prevent redundancy and enhance your vocabulary.
One can use a thesaurus to find synonyms and antonyms to a word. For example, one could look up 'use' in a thesaurus and find that synonyms are utility,application, purpose, and handling. Antonyms are disuse and misuse.
No, thesauruses tell you words that can be used in place of whatever word you look up. Dictionaries define whatever word you look up.
To a dictionary or a thesaurus
Yes, a thesaurus can be used to find synonyms for a given word, helping to expand vocabulary and find alternative ways to express an idea.
Deadly, look it up in a thesaurus
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A thesaurus -apex
Just look up the word in the thesaurus and there will be a list of words that are synonyms. If you are using an online thesaurus the steps are similar, type in the word and press enter.
Sure. You can use one word instead of another, and one that means the same thing essentially (a synonym). A Thesaurus is used for exactly this purpose... to look up words that have a very similar meaning to the one you look up. Try an online thesaurus if you can't think of any alternate words on your own.
If you have the meaning or definition then you will have a synonym of the word. Look up that synonym in a thesaurus.
Try: calm, sedate, reserved, or plodding. There are more that you can look up in a thesaurus.