arroyo [arroyos](creek which only seasonally flows) noun [UK: ə.ˈrɔɪəʊ] [US: ə.ˌrɔɪo.ʊ]
brook [brooks](a small stream) noun [UK: brʊk] [US: ˈbrʊk]She watched the children playing in the brook. = Ella observó a los niños jugando en el arroyo.
creek [creeks](stream of water) noun [UK: kriːk] [US: ˈkriːk]
stream [streams](small river) noun [UK: striːm] [US: ˈstriːm]The ball rolled into the stream. = La pelota rodó hasta el arroyo.