safety deposit box vs deedbox

safety deposit box and deedbox both are nouns.

Word	Noun	Adjective	Verb	Adverb
safety deposit box	Yes	No	No	No
deedbox	Yes	No	No	No

As nouns, deedbox is a hypernym of safety deposit box; that is, deedbox is a word with a broader meaning than safety deposit box:

safety deposit box: a fireproof metal strongbox (usually in a bank) for storing valuables
deedbox: a strongly made box for holding money or valuables; can be locked

Other hypernyms of safety deposit box include strongbox.

safety deposit box (noun)	deedbox (noun)
a fireproof metal strongbox (usually in a bank) for storing valuables	a strongly made box for holding money or valuables; can be locked