b37,

most search engines have a wildcard feature, so you can search for *dit, for example. I tried this at OneLook, but most of the resources returned "too many matches" after getting to 'credit' or thereabouts. I did get a few interesting hits though.

pandit - a wise man (in India)
adit - an entrance to a cave (a crossword staple, as I recall)
geddit - this surprise from the Cambridge International is given as: interjection BRITISH INFORMAL; used at the end of a statement to attract attention to an obvious play on words, geddit?

I don't think any of these support your theory.