coin bank vs savings bank

coin bank and savings bank both are nouns.

Word	Noun	Adjective	Verb	Adverb
coin bank	Yes	No	No	No
savings bank	Yes	No	No	No

As nouns, coin bank and savings bank are synonyms defined as:

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

Other synonyms of coin bank include bank, money box.

coin bank (noun)	savings bank (noun)
a container (usually with a slot in the top) for keeping money at home	a container (usually with a slot in the top) for keeping money at home
	a thrift institution in the northeastern United States; since deregulation in the 1980s they offer services competitive with many commercial banks