trough Synonyms

manger gully ravine rut sewer sluice sluiceway socket spillway strath rabbet pit pentrough gutter hole hollow hollowness indentation kennel moat penstock sulcus till raceway mineshaft entrenchment sinkhole bathyphase rain gutter rainy day public treasury gutters feed bunk watercourse tray trench vale valley waterer waterway air pocket cavitied birdbath feeding trough aqueduct cloaca concave conduit crater crib