savings bank vs coin bank

savings bank and coin bank both are nouns.

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

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

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

Other synonyms of savings bank include bank, money box.

savings bank (noun)	coin 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