yawper

From yawp +‎ -er.

yawper (plural yawpers)

1. A person who yawps; one who cries vigorously.
2. A loud complainer.

• “yawper” in Webster’s Seventh New Collegiate Dictionary: Based on Webster’s Third New International Dictionary, 7th edition, Springfield, Mass.: G[eorge] & C[harles] Merriam, 1963 (1967 printing), →OCLC.