ˈ ̷ ̷ ̷ ̷ˌmȯrf noun
( -s )
Etymology: International Scientific Vocabulary is- + -morph
: something identical with or similar to something else in form or shape or structure: as
a. : one of two or more substances related by isomorphism
b. : an individual or group exhibiting isomorphism
c. : a ciphertext pattern recurring with different constituent letters
FXEXRF and PZMZTP are isomorphs