Yes! There is actually a minefield of keywords and phrases that cannot or should not be used on a website, and it changes both by industry and your specific business model.
Negative Keywords: Illegal To Use
The first one to tackle is to make a list of terms and phrases that you legally cannot utilize. Often for products, excessive promises of particular benefits if it’s a medical/health product can be out of bounds. You also may have pecuiliar company history that could put particular terms or phrases off limits due to current, past or pending law suits or “messy divorce” from a previous business partner!
Negative Keywords: False Positive Terms & Slang
English is a slippery fish! There could be terms that have more than meaning or connotation. If you’re British and have a company providing media, the term “BBC” may have one connotation but have NSFW meanings in a different context!
Negative Keywords: Innapropriate For Brand
These terms could be for a luxury spa to avoid “cheap, inexpensive” terms or phrases. Or perhaps your CEO has a particular dislike of a keyword, like “swamp cooler” for an AC unit. There’s lots of reason why a brand chooses a particular “voice” in it’s copy and text, so you should know your redlines before you cross them!