A pitcher is a container with a spout used for pouring its contents.
An ewer is a pitcher, often decorated, with a base, oval body, and flaring spout. A famous example is the America's Cup trophy.
Ewer from Iran, dated 1180-1210CE. Repousse brass inlaid with silver and bitumen, NY Metropolitan Museum
America's cup, 1848
Eleanor Roosevelt's silver water pitcher
A ewer of Rubino glass
Baptismal ewer and basin (1711, Spanish master)
Rock crystal ewer, 1000-1050 V&A Museum no. 7904-1862
