isogram

David Crystal says that an isogram isn't necessarily a word in which no letter is repeated, but a letter in which the letters have the same frequency. "But to the ludic linguist, Wilmcote is a first-order isogram, or heterogram. Not a very interesting one, admittedly, but a first-order isogram nonetheless.

An isogram is a word in which the letters turn up an equal number of times. In a first-order isogram, each letter appears just once: dialogue is an example. In a second-order isogram, each letter appears twice: deed is an example. Longer examples are hard to find: they include Vivienne, Caucasus, intestines, and (important for a phonetician to know this) bilabial. In a third-order isogram, each letter appears three times. These are very rare, unusual words such as deeded ('conveyed by deed'), sestettes (a variant spelling of sextets), and geggee ('victim of a hoax)."
By Hook or By Crook by David Crystal, p 192

David Crystal says that an isogram isn't necessarily a word in which no letter is repeated, but a letter in which the letters have the same frequency. "But to the ludic linguist, Wilmcote is a first-order isogram, or heterogram. Not a very interesting one, admittedly, but a first-order isogram nonetheless.

An isogram is a word in which the letters turn up an equal number of times. In a first-order isogram, each letter appears just once: dialogue is an example. In a second-order isogram, each letter appears twice: deed is an example. Longer examples are hard to find: they include Vivienne, Caucasus, intestines, and (important for a phonetician to know this) bilabial. In a third-order isogram, each letter appears three times. These are very rare, unusual words such as deeded ('conveyed by deed'), sestettes (a variant spelling of sextets, and geggee ('victim of a hoax)."
By Hook or By Crook by David Crystal, p 192

E.g., ambidextrously.

A word in which no letter is repeated