It is twenty years since isomorphs were given significant room in Word Ways; "A Pattern Word Quiz" by Mary and Harry Hazard, appears in the November 1980 issue. In view of this time lapse, readers might find it useful to be reminded of the terminology associated with isomorphs.
Word Ways: Vol. 34
, Article 4.
Available at: http://digitalcommons.butler.edu/wordways/vol34/iss2/4