RhymeZone: yelper definitions

Definitions of yelper:

noun: One who yelps.
noun: (UK, dialect) The avocet (so-called from its sharp, shrill cry).
noun: (US, dialect) A bird, the tattler.
noun: (Internet) A user of Yelp, an Internet service that publishes crowdsourced reviews of local businesses.

(Definitions from Wiktionary)