Add to ORKGWebster\u27s Third New International Dictionary (NI3) defines pattern-word as, (in) cryptology: a plaintext idiomorph . The same source defines idiomorph as, a pattern of repeated letters in cryptography . Thus to a cryptanalyst any word with one or more repeated letters is a pattern-word. PROPER, STATE and MUUMUU are pattern-words, whereas THING, WORD and UNCOPYRIGHTABLE are not. In a simple substitution, monoalphabetic cryptogram, pattern-words can provide a method of quick solution where the cyrptogram is of the easy or medium-difficult variety. Thus a long word ending with the pattern -ABCC is very likely to end in NESS. The ending -DBBC is often -ALLY
