Pet name and Rubric

Pet name noun - A name of endearment (especially one using a diminutive suffix).

Rubric and pet name are semantically related. In some cases you can use "Rubric" instead a noun phrase "Pet name".

Rubric noun - A word or series of words often in larger letters placed at the beginning of a passage or at the top of a page in order to introduce or categorize.

Pet name and rubric are semantically related. Sometimes you can use "Pet name" instead a noun "Rubric".