Roget's Thesaurus or any thesaurus
Synonyms are found in a dictionary or a thesaurus.
The thesaurus is used to find synonyms and antonyms of a word.
A thesaurus is a book full of synonyms. In all Dr. Suess' books.
Thesaurus in German is Synonymwörterbuch, Thesaurus
A thesaurus is used to find and insert a synonym for an overused word.
thesaurus
A dictionary of synonyms is called a thesaurus.
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.
The thesaurus allowed the writer to change words from ones that kind of meant what she wanted to say to words that meant exactly what she was trying to say.
You can find synonyms of nearly any English word through the use of a thesaurus, with the one known as "Roget's Thesaurus" being the most widely used. Thesaurus references are available online.
dictionary and thesaurus