Making words out of letters of a different word. For example:
R E T R I B U T I O N
return tribute iron notion note tone rib tube bruit tent tribe bur button rent burin nob bite burr run route tire tore bent bet bonnet rub nib net nub bin nut bit rube ruin rob rot unit union unite tier tie tin tint tone toe brute burn brunt butt butter riot tot tenet tenure terrier retro bone boot born bout totter tote tour bore
R E T R I B U T I O N
return tribute iron notion note tone rib tube bruit tent tribe bur button rent burin nob bite burr run route tire tore bent bet bonnet rub nib net nub bin nut bit rube ruin rob rot unit union unite tier tie tin tint tone toe brute burn brunt butt butter riot tot tenet tenure terrier retro bone boot born bout totter tote tour bore