savings account vs bank account

savings account and bank account both are nouns.

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

As nouns, bank account is a hypernym of savings account; that is, bank account is a word with a broader meaning than savings account:

savings account: a bank account that accumulates interest
bank account: a fund that a customer has entrusted to a bank and from which the customer can make withdrawals

savings account (noun)	bank account (noun)
a bank account that accumulates interest	a fund that a customer has entrusted to a bank and from which the customer can make withdrawals