a. What is the longest English word that begins and ends with the same letter?

b. What letters do not provide even one qualifying candidate having this feature?

c. Same as a, but no repeated letters except the first and the last (none of the title's word qualify).

(In reply to re: computer solutions by Ady TZIDON)

The reason several appear twice is that separate current maxima were kept: one for all words, one for words not beginning and ending with S.  If it doesn't begin and end with S, and it appears before larger S---S words appear, the word appears twice.

Posted by Charlie on 2015-02-26 19:52:38