safety deposit box vs safe-deposit box

safety deposit box and safe-deposit box both are nouns.

Word	Noun	Adjective	Verb	Adverb
safety deposit box	Yes	No	No	No
safe-deposit box	Yes	No	No	No

As nouns, safety deposit box and safe-deposit box are synonyms defined as:

safety deposit box and safe-deposit box: a fireproof metal strongbox (usually in a bank) for storing valuables

Other synonyms of safety deposit box include deposit box, lockbox, safe-deposit, safety-deposit.

safety deposit box (noun)	safe-deposit box (noun)
a fireproof metal strongbox (usually in a bank) for storing valuables	a fireproof metal strongbox (usually in a bank) for storing valuables