We put in a lot of effort to remove rude words, and words that could be offensive in combination with other words. In addition, we are sensitive to cultural considerations that can vary significantly by language. It is possible that some words that are innocuous on their own will be displeasing in certain combinations with specific other words.
However, we believe that there are more potentially offensive real place names in the world than on what3words. See: http://maps.geotastic.org/rude/ (or just search online for "rude place names").