allegory vs emblem

allegory and emblem both are nouns.

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

As nouns, allegory and emblem are synonyms defined as:

allegory (noun)	emblem (noun)
a short moral story (often with animal characters)	special design or visual object representing a quality, type, group, etc.
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
a visible symbol representing an abstract idea