Solomon's seal vs allegory

Solomon's seal and allegory both are nouns.

Word	Noun	Adjective	Verb	Adverb
Solomon's seal	Yes	No	No	No
allegory	Yes	No	No	No

As nouns, allegory is a hypernym of Solomon's seal; that is, allegory is a word with a broader meaning than Solomon's seal:

Solomon's seal: a six-pointed star formed from two equilateral triangles; an emblem symbolizing Judaism
allegory: a visible symbol representing an abstract idea

Other hypernyms of Solomon's seal include emblem, hexagram.

Solomon's seal (noun)	allegory (noun)
a six-pointed star formed from two equilateral triangles; an emblem symbolizing Judaism	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