Final answer:
Roget's International Thesaurus is a resource that provides synonyms and antonyms for words, helping users to enhance their vocabulary and writing by finding more precise or varied language.
Step-by-step explanation:
Roger's International Thesaurus is best described as a dictionary of synonyms and antonyms.
Unlike a standard dictionary, a thesaurus like this does not focus on grammatical usage or nonstandard speech; instead, it helps users find words that have the same or opposite meanings to improve their writing or understand the variety of language.
This tool is particularly valuable when a writer wants to avoid repetition or find a more precise word that fits better in the context of their work.