Is there a German dictionary that lists words with the same root together, e.g., where abstimmen, mitbestimmen, zustimmen etc. are listed under stimmen?
A click on Wordformation will lead to the following tree (only shown in part):
One level above would be for the stem Stimme with even more derivations.
Also see this related question (in German):
Howard Kellerʹs 1978 "A German Word Family Dictionary" is pretty useful.