enneagram

As a noun enneagram

is (mathematics) a nine-pointed stellate polygon.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between anagram and enneagram

is that anagram is a word or phrase that is created by rearranging the letters of another word or phrase while enneagram is a nine-pointed stellate polygon.

As a verb anagram

is to form anagrams.