trough

nouns

a narrow depression (as in the earth or between ocean waves or in the ocean bed)
trough
is a type of (narrower)
a sunken or depressed geological formation
depression, natural depression
a channel along the eaves or on the roof; collects and carries away rainwater
gutter, trough
a concave shape with an open top
bowl, trough
a treasury for government funds
public treasury, till, trough
a long narrow shallow receptacle
trough
is a type of (narrower)
a container that is used to put or keep things in
receptacle
a container (usually in a barn or stable) from which cattle or horses feed
manger, trough