Certain keywords are “restricted” on Google Ads, which means either that they are completely banned (meaning you can’t run ads against them), or that you have to be approved, get a license, etc. Google is not transparent about which words are on the list and what the restrictions mean.
I’ve learned about them as I run into them for clients. Here are some examples –
#1 – d / r/ u / g rehab, alcohol t / r/ e/ a/ t/ m/ e/ n/ t and related keywords. These are not totally banned. If you have a certification in the United States, you can run Google Ads against them – but you have to meet certification requirements.
#2 – printer repair. You can run ads “triggered” by this keyword but not include the term “printer repair” in your ads; except possibly in call outs. So no “printer repair” in headlines, but OK in call outs.