flotsam

As nouns the difference between flotsam and vagrant

is that flotsam is debris floating in a river or sea, in particular fragments from a shipwreck while vagrant is a person without a home or job.

As an adjective vagrant is

moving without certain direction; wandering; erratic; unsettled.

As nouns the difference between detritus and flotsam

is that detritus is pieces of rock broken off by ice, glacier, or erosion while flotsam is debris floating in a river or sea, in particular fragments from a shipwreck.

As nouns the difference between flotsam and jettison

is that flotsam is debris floating in a river or sea, in particular fragments from a shipwreck while jettison is collectively, items that have been or are about to be ejected from a boat or balloon.

As a verb jettison is

to eject from a boat, submarine, aircraft, spaceship or hot-air balloon, so as to lighten the load.