It works.

First of all, registered trademarks require distinctiveness. If the everyday language is too common, it can easily be considered as lacking in distinctiveness and the registration application will be rejected.

Second, registering commonly used words as trademarks and preventing others from using the words violates public order and good customs. Article 8 of my country's "General Principles of Civil Law" stipulates that civil subjects shall not violate the law or public order and good customs when engaging in civil activities. Article 153 stipulates that civil legal acts that violate public order and good customs are invalid.

Now is not a feudal dynasty, and there is no rule to avoid the taboo of the emperor's name. Arbitrarily preventing others from using words reasonably is a hegemonic behavior and is not protected by law.