These are entries from Duden Etymologie: Herkunftswörterbuch der deutschen Sprache, Mannheim 1997. See also the interactive map 
.
Ball etymology
source 
Since this network has interested me since long ago, there is also a blog post from 2004, and previous map versions from 2015 (less interactive map ) and 2000 (merely clickable image )
* bald * Balg * Balken * Balkon * Ball * Ballen * Ballon * blaehen * blasen * Blatt * Blatter * blühen * Blüte * Blume * Blust * Blut * Bohle * Bollwerk * Boulevard * Budget * Bulle * Chlor * Chlorophyll * Exemplar * Fauna * Feuilleton * Finte * Flor * Flora * Florett * florieren * Floskel * Folie * folio * Format * Oktav * parieren * Phalanx * Planke * Polster * schnell * Wechsel