carp vs waul

carp

verb
  • To complain about a fault; to harp on. 

noun
  • Any of various freshwater fish of the family Cyprinidae, especially the common carp, Cyprinus carpio. 

waul

verb
  • To wail, to cry plaintively. 

How often have the words carp and waul occurred in a corpus of books? (source: Google Ngram Viewer )