The question about porcelain pertains to the precise category of the pot. Judy said above that you should not consider the pot "gaudy," but she likely meant that it is technically not "Gaudy Welsh", since it lacks the terra cotta (brick red) color that is one of the diagnostic colors for Gaudy Welsh. (It should be noted that some Gaudy Welsh collectors make exceptions to this rule and would consider this pot Gaudy Welsh, but again, technically it isn't.
The presence of more than one color qualifies it as some sort of gaudy ceramic. The term "gaudy" is used to indicate that it is hand-painted in more than one color, while the term "polychrome" indicates a transfer-decorated item of more than one color. If this body is ironstone (generally not translucent), then it would be called "gaudy ironstone". On the other hand, if this body is porcelain, it could be called "gaudy porcelain". The term "gaudy porcelain" is not in wide use, as many other terms - such as "gaudy soft paste" are sometimes used to mean the same thing. Often, collectors are not even aware of the composition of the ceramic body, and are surprised when they learn what they have.