In the May 1978 Kickshaws, I pointed out that five-letter words still have unexplored logological aspects. For example, I showed that all 130 possible combinations of each alphabetical letter in each position exist as words, nearly all common enough to be in the Pocket Webster.
Beaman, Ralph G.
"From AB--- to ---YZ,"
Word Ways: Vol. 11
, Article 11.
Available at: http://digitalcommons.butler.edu/wordways/vol11/iss4/11