Bel-Merodach vs Marduk

Bel-Merodach and Marduk both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bel-Merodach	Yes	No	No	No
Marduk	Yes	No	No	No

As nouns, Bel-Merodach and Marduk are synonyms defined as:

Bel-Merodach and Marduk: the chief Babylonian god; his consort was Sarpanitu

Other synonyms of Bel-Merodach include Baal Merodach, Merodach.

Bel-Merodach (noun)	Marduk (noun)
the chief Babylonian god; his consort was Sarpanitu	the chief Babylonian god; his consort was Sarpanitu