Urna derives from a Latin word 'urna' which refers to a container usually shaped like a vase or an urn. It has been used to hold cremated ashes for centuries. However, the words used to describe urna or a vase have a variety of synonyms. Some of these include container, jar, pot, vessel, cask, amphora, and receptacle. Each synonym has its own unique connotation and usage, but they all refer to some sort of container that holds things. It is important to choose the right synonym for the context, as different words can change the tone and meaning of a sentence.