bank

banking

box

business

cash

circular

closed

code

combination

compartment

corridor

currency

danger

dark

deposit

depository

detail

door

expensive

finance

financial

folders

gear

gold

handle

hard

heavy

heist

impenetrable

inside

insurance

investment

iron

keep

lock

machine

mechanical

mechanism

metal

metallic

money

mystery

nobody

password

precious

protect

protection

reliability

reliable

render

repository

robbery

room

round

safe

safety

savings

secrecy

secret

secure

security

silver

solid

stainless

steel

storage

storehouse

strength

stronghold

system

treasure

trust

unlock

valuables

vault

wall

warehouse

wealth