Should the headline have been find the correct words? Maybe find the proper words?
Yes, the thesaurus (and its cousin the dictionary) has long had a home on the web. Now synonyms, antonyms, and even rhyming words can have a home in your application. A site calling itself The Big Huge Thesaurus has an API.
There are several fun word games I can imagine that could be created with the API. The more practical use might be to help your users as they craft just the right words as part of a WYSIWYG editor.
The API has a super-simple REST interface, making it quick to get started. The service does require an API key. The free version is limited to 10,000 requests per day, a limit larger than many APIs.
See also:
