Kangaroo word
A kangaroo word is a word that contains all the letters of one of its synonyms or a closely related word, called a joey word, arranged so that these letters appear in the same order in both words. For example, the word inflammable is a kangaroo word containing the joey word flammable; the words action, appropriate [has apt], chocolate [has cocoa] and advertisement (a twin kangaroo, containing ad and advert) also each include their own synonyms/related words.