What's the difference between plash and pleach?

Plash

Definition:

(v.) A small pool of standing water; a puddle.
(v.) A dash of water; a splash.
(v. i.) To dabble in water; to splash.
(v. t.) To splash, as water.
(v. t.) To splash or sprinkle with coloring matter; as, to plash a wall in imitation of granite.
(v. t.) To cut partly, or to bend and intertwine the branches of; as, to plash a hedge.
(n.) The branch of a tree partly cut or bent, and bound to, or intertwined with, other branches.