coin bank vs money box

coin bank and money box both are nouns.

Word	Noun	Adjective	Verb	Adverb
coin bank	Yes	No	No	No
money box	Yes	No	No	No

As nouns, coin bank and money box are synonyms defined as:

coin bank and money box: a container (usually with a slot in the top) for keeping money at home

Other synonyms of coin bank include bank, savings bank.

coin bank (noun)	money box (noun)
a container (usually with a slot in the top) for keeping money at home	a strongbox for holding cash
	a container (usually with a slot in the top) for keeping money at home