Epithet and Trademark

Epithet noun - A descriptive or familiar name given instead of or in addition to the one belonging to an individual.

Trademark and epithet are semantically related. In some cases you can use "Trademark" instead a noun "Epithet".

Trademark noun - A device (as a word) identifying the maker of a piece of merchandise and legally reserved for the exclusive use of that person or company.

Epithet and trademark are semantically related. Sometimes you can use "Epithet" instead a noun "Trademark".