Is there a way to avoid being interrupted by the dictionary prompt?

Is there a way to deactivate the dictionary? I'm a writer, the dictionary interrupt me all the time with 'errors' and searches I would never ask to make (I know what I'm writing; Even if I use uncommon words); I tried to deactivate it, but it is 'necessary' for the system... Or should I have to install another Operative System to avoid being interrupted?

It is giving me an amazing hard time.

My OS is Mojave.

Thanks!