Solomon's seal vs emblem

Solomon's seal and emblem both are nouns.

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

As nouns, emblem is a hypernym of Solomon's seal; that is, emblem 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
emblem: a visible symbol representing an abstract idea

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

Solomon's seal (noun)	emblem (noun)
a six-pointed star formed from two equilateral triangles; an emblem symbolizing Judaism	special design or visual object representing a quality, type, group, etc.
	a visible symbol representing an abstract idea