Using Harold Newman's
An Illustrated Dictionary of Glass:
Tumbler = a drinking glass without a handle, foot or stem and having a flat base.
Beaker = a drinking glass without a handle which often has a flared mouth and flat base but sometimes has a stemmed foot. [But apparently the original term sometimes referred to examples that did have a handle and a spout (or "Beak")]
Jug = a vessel used for pouring liquids and usually with a lip or spout and often with a looped handle.
Ewer = a type of jug with a number of features one of which is usually a large looped handle.
Pitcher = the name that people in the Americas use instead of "jug".
Pony = same as a Whiskey Glass
Glass, as a term for a vessel or other formed item, is not listed by Newman. But I guess it is usually a simple contraction of "drinking glass", although "spy glass" and perhaps even "looking glass" have also been contracted to "glass".
Further qualifications or amendments to any of the above are welcome.
