coris-

1. A pet name; especially, a diminutive or abbreviated form of someone's full name: "We called him Billy as a hypocorism for William."
2. The use of a pet name to address someone, instead of his or her full name.
3. A name of endearment; a pet name.
4. Etymology: from Late Latin hypocorisma, from Greek hupokorisma, from hupokorizesthai, "to call by endearing names".

A pet name.

1. Names of endearment.
2. Pet names.

A descriptive term referring to the use of pet names.

Endearing, as a pet name, diminutive, or euphemistic.

A descriptive term with reference to the use of an endearing, a pet name, or a euphemism.