You want us to fill in the blank?
If yes, I'm sure the answer of the blank is "earn". T
here were several verbs have similar meaning with the word "earn", they are: get, win and beat. Among these words, only "earn" this one has the meaning of "earning money by doing something".
Based on you sentence, "judges______more money than lawyers do.", the last word "do" give the hint that the blank must be a verb. It is because "do" itself is a verb, and this is a comparing between judges and lawyers.
Like what I mentioned before, the judges must DO someting to have the income, so "earn" this word is the answer.