allegory vs allegorical

allegory is a noun but allegorical is not a noun.

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

allegory (noun)	allegorical (noun)
a short moral story (often with animal characters)
an expressive style that uses fictional characters and events to describe some subject by suggestive resemblances; an extended metaphor
a visible symbol representing an abstract idea

allegory (adjective)	allegorical (adjective)
	used in or characteristic of or containing allegory