melodic theme vs musical theme

melodic theme and musical theme both are nouns.

Word	Noun	Adjective	Verb	Adverb
melodic theme	Yes	No	No	No
musical theme	Yes	No	No	No

As nouns, melodic theme and musical theme are synonyms defined as:

melodic theme and musical theme: (music) melodic subject of a musical composition

Other synonyms of melodic theme include idea, theme.

melodic theme (noun)	musical theme (noun)
(music) melodic subject of a musical composition	(music) melodic subject of a musical composition