Ditch
Part of speech: noun
Definition: A trench; a long, shallow indentation, as for irrigation or drainage.
Part of speech: verb
Definition: To discard or abandon. To deliberately crash-land an airplane on the sea. To deliberately not attend classes; to play hookey. To dig ditches. To dig ditches around.
Swale
Part of speech: noun
Definition: A low tract of moist or marshy land.A long narrow and shallow trough between ridges on a beach, running parallel to the coastline.A shallow troughlike depression that's created to carry water during rainstorms or snow melts; a drainage ditch.A shallow, usually grassy depression sloping downward from a plains upland meadow or level vegetated ridgetop.A shallow trough dug into the land on contour (horizontally with no slope). Its purpose being to allow water time to percolate into the soil.