There may be situations where you want to filter out all records that contain a specific word or words. As long as the attributes containing this word are searchable, you can achieve this filtering using the advanced search syntax. For example, if you have an attribute with a value like "wordone wordtwo" you can add "-wordtwo" to your queries to exclude records containing "wordtwo".
A more elegant solution would be to move this logic to the records themselves so that a simple filter can be added at query time. Continuing the example above, you could create a boolean attribute - 'contains-word-two' - indicating whether the record contains "wordtwo", and then filter on that value.