armored
armour
bank
banking
black
blocked
bolt
box
business
chrome
cipher
closed
code
combination
dark
depository
door
drive
finance
fireproof
firm
glitter
gray
handle
iron
key
knob
lock
mechanical
metal
money
number
protection
reliability
riches
safe
safety
secret
secure
sepia
shiny
stability
steel
store
strong
valuable
value
wealth