Baby-talk, e.g. bow-wow for dog, choo-choo for train.
Such a suffix
A descriptive name added to or replacing the actual name of a person, place, or thing.
Find another word for pet-name. In this page you can discover 7 synonyms, antonyms, idiomatic expressions, and related words for pet-name, like: byname, hypocorism, affectionate name, diminutive, nickname, pretty name and hypocoristic.