Star of David vs Magen David

Star of David and Magen David both are nouns.

Word	Noun	Adjective	Verb	Adverb
Star of David	Yes	No	No	No
Magen David	Yes	No	No	No

As nouns, Star of David and Magen David are synonyms defined as:

Star of David and Magen David: a six-pointed star formed from two equilateral triangles; an emblem symbolizing Judaism

Other synonyms of Star of David include Mogen David, Shield of David, Solomon's seal.

Star of David (noun)	Magen David (noun)
a six-pointed star formed from two equilateral triangles; an emblem symbolizing Judaism	a six-pointed star formed from two equilateral triangles; an emblem symbolizing Judaism