debris
scattered remains of something destroyed or discarded
dead wood
collective term for dead trees or their parts
space debris
defunct artificial object or collection of such objects in space
marine debris
human-created waste that has deliberately or accidentally been released in a lake, sea, ocean or waterway
driftwood
wood that has washed ashore
large woody debris
logs, branches, and other wood that falls into streams and rivers
debris
term in medicine indicating remnants such as surgical treatments