A Rack
A bed on top of a bed is called a bunk bed
a small bed is called a toddler bed.
the ships carrying emigrants were called "coffin" ships
Coffin ships were called coffin ships because lots of people died on them
Because they were ships? Do you mean longships? They were long and thin.
A ships accountant is called a "PURSER"
Why are you called you? Same answer because it is
Ships crew
a number of ships is called a fleet.
a bed on a train is called a "berth"
Its called quads
its called a bunk bed