Does the German language have any other etymologically connected words in which the letter "v" corresponds to the letter "f", e.g.
vor/Fürst/führen
Does the German language have any other etymologically connected words in which the letter "v" corresponds to the letter "f", e.g.
vor/Fürst/führen
The only other example the consulted dictionaries are providing is:
And it looks like as this is the only other example of the v-f-alternation within a German word-family (like your vor - Fürst). However, you have to keep in mind, that these rules for using v or f in certain words are a product of "modern" spelling regulations and have nothing to do with their pronunciation.
--- A quick note on your example: The verb führen is etymologically not connected to vor or Fürst.