riddle canon vs enigmatical canon

riddle canon and enigmatical canon both are nouns.

Word	Noun	Adjective	Verb	Adverb
riddle canon	Yes	No	No	No
enigmatical canon	Yes	No	No	No

As nouns, riddle canon and enigmatical canon are synonyms defined as:

riddle canon and enigmatical canon: a canon in which the entrances of successive parts were indicated by cryptic symbols and devices (popular in the 15th and 16th centuries)

Other synonyms of riddle canon include enigma canon, enigmatic canon.

riddle canon (noun)	enigmatical canon (noun)
a canon in which the entrances of successive parts were indicated by cryptic symbols and devices (popular in the 15th and 16th centuries)	a canon in which the entrances of successive parts were indicated by cryptic symbols and devices (popular in the 15th and 16th centuries)