Shortly after Howard Bergerson resigned from the editorship of Word Ways, eh wrote to tell me of his latest logological discovery: PEPPERETTE, a word containing four of one letter, three of a second letter, two of a third letter, and one of a fourth letter. According to the 1969 Britannica Yearbook, a pepperette is "a girl who does a dance routine during an intermission at an athletic contest". Although the word fills an obvious gap, it doesn't seem to have caught on; in the intervening 12 years, I have never seen it used, nor does it appear in the 1971 Addenda of Webster's Third Edition.
Keller, Robert Cass
"Tennessee's Sleeveless Pepperette,"
Word Ways: Vol. 15
, Article 23.
Available at: http://digitalcommons.butler.edu/wordways/vol15/iss2/23