Is there a German dictionary that lists words with the same root together, e.g., where abstimmen, mitbestimmen, zustimmen etc. are listed under stimmen?
Canoonet offers quite a nice clickable word formation tree for many word stems including 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):
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*stimmen
in Canoo or Leo. – Crissov Mar 28 '16 at 13:06*stimmen
also works with the CD-ROM versions of the Duden dictionaries. – user9551 Mar 28 '16 at 13:42