music box vs musical box

music box and musical box both are nouns.

Word	Noun	Adjective	Verb	Adverb
music box	Yes	No	No	No
musical box	Yes	No	No	No

As nouns, music box and musical box are synonyms defined as:

music box and musical box: produces music by means of pins on a revolving cylinder that strike the tuned teeth of a comb-like metal plate

music box (noun)	musical box (noun)
produces music by means of pins on a revolving cylinder that strike the tuned teeth of a comb-like metal plate	produces music by means of pins on a revolving cylinder that strike the tuned teeth of a comb-like metal plate