Solomon's seal vs hexagram

Solomon's seal and hexagram both are nouns.

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

As nouns, hexagram is a hypernym of Solomon's seal; that is, hexagram 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
hexagram: a regular polygon formed by extending each of the sides of a regular hexagon to form two equilateral triangles

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

Solomon's seal (noun)	hexagram (noun)
a six-pointed star formed from two equilateral triangles; an emblem symbolizing Judaism	a regular polygon formed by extending each of the sides of a regular hexagon to form two equilateral triangles