Agnus Dei vs allegory

Agnus Dei and allegory both are nouns.

Word	Noun	Adjective	Verb	Adverb
Agnus Dei	Yes	No	No	No
allegory	Yes	No	No	No

As nouns, allegory is a hypernym of Agnus Dei; that is, allegory is a word with a broader meaning than Agnus Dei:

Other hypernyms of Agnus Dei include emblem.

Agnus Dei (noun)	allegory (noun)
figure of a lamb; emblematic of Christ	a short moral story (often with animal characters)
a liturgical prayer beginning with these Latin words	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