Marduk vs Bel-Merodach

Marduk and Bel-Merodach both are nouns.

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

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

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

Other synonyms of Marduk include Baal Merodach, Merodach.

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