gradate vs rhyme

gradate

verb
  • To change imperceptibly from one gradation of tone etc. to another. 

  • To arrange in order of grades. 

  • To bring to a certain strength or grade of concentration. 

rhyme

verb
  • Of a word, to be pronounced identically with another from the vowel in its stressed syllable to the end. 

  • To somewhat resemble or correspond with. 

  • To compose or treat in verse; versify. 

  • Of two or more words, to be pronounced identically from the vowel in the stressed syllable of each to the end of each. 

noun
  • A word that rhymes with another, in that it is pronounced identically with the other word from the vowel in its stressed syllable to the end. 

  • A thought expressed in verse; a verse; a poem; a tale told in verse. 

  • rime 

  • A word that rhymes with another. 

  • Rhyming verse (poetic form) 

  • Rhyming: sameness of sound of part of some words. 

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