allegory vs medallion

allegory and medallion both are nouns.

Word	Noun	Adjective	Verb	Adverb
allegory	Yes	No	No	No
medallion	Yes	No	No	No

As nouns, medallion is a hyponym of allegory; that is, medallion is a word with a more specific, narrower meaning than allegory:

allegory (noun)	medallion (noun)
a short moral story (often with animal characters)	an award for winning a championship or commemorating some other event
an expressive style that uses fictional characters and events to describe some subject by suggestive resemblances; an extended metaphor	an emblem indicating that a taxicab is registered
a visible symbol representing an abstract idea	a circular helping of food (especially a boneless cut of meat)
	a circular helping of food (especially a boneless cut of meat) "medallions of veal"
	any of various large ancient Greek coins