riming vs unrhymed

riming

adj

  • That rimes (i.e., covers with rime or hoar frost) something. 

noun

  • The process of riming (i.e., covering with rime or hoar frost). 

unrhymed

adj

  • Having no rhyme. 

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