A belated welcome to Fluther!
There are two options available.
1.) Up in the top right corner of the Fluther page, there is a Search box. Type in one of the key words, and it pulls up a list of questions already asked that have the same word. If the word has been used frequently, it may take expanding the list by clicking on “See All”.
2.) If the search isn’t used first, when creating a new question, there is a function that will pull up previous questions with the same key word or words. Then you can decide if one is too closely similar and abandon it or continue with the process.