is that linch is a ledge, a terrace; a right-angled projection; a lynchet while cotter is (mechanical engineering) a pin or wedge inserted through a slot to hold machine parts together or cotter can be a peasant who performed labour in exchange for the right to live in a cottage.
is that slinch is (physics|informal) an english unit of mass equal to 12 slugs (386088 pounds-mass), that accelerates by 1 inch per second squared (1 in/s²) when a force of one pound-force (lbf) is exerted on it while linch is a ledge, a terrace; a right-angled projection; a lynchet.