allegory vs Mogen David

allegory and Mogen David both are nouns.

Word	Noun	Adjective	Verb	Adverb
allegory	Yes	No	No	No
Mogen David	Yes	No	No	No

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

allegory: a visible symbol representing an abstract idea
Mogen David: a six-pointed star formed from two equilateral triangles; an emblem symbolizing Judaism

allegory (noun)	Mogen David (noun)
a short moral story (often with animal characters)	a six-pointed star formed from two equilateral triangles; an emblem symbolizing Judaism
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