oonuh vs y'all

oonuh

pron

  • You (plural); y'all, you guys, you all. 

y'all

det

  • Your pl; y'all's 

  • The group spoken or written to. 

verb

  • To use the pronoun "y'all" (to). 

How often have the words oonuh and y'all occurred in a corpus of books? (source: Google Ngram Viewer )