Diplograms
These are words with every different letter appearing only twice

Haplogram
These are words with every different letter appearing only once

Triplogram
These are words with every different letter appearing only three times

A Pascal Word
These are words with one different letter once, another twice, another thrice ... and so on.
 

(Are there more to this list?)

Ted Clarke is undertaking the enhancement of the WordsWorth Compendium's words and phrases to portray them in a number of forms, 
such as:

1.  normal words

2.  word with letters in reverse order 

3.  alphwords (explain ..)

4.  isomorphic codings    (explain ..)

5.  gematric codings   (explain ..)

For example:

BEERBIBBER  REBBIBREEB  BBBBEEEIRR  1223141123  68

The third and fourth forms clearly show that beerbibber is also a Pascal word.
 

(need more clarification here I think)

(Uses of these or other peculiarities?)
 

(Anything Else I have forgotten ? )