Mogen David vs Magen David

Mogen David and Magen David both are nouns.

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

As nouns, Mogen David and Magen David are synonyms defined as:

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

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

Mogen 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