appreciate vs ideate

appreciate

verb
  • To be fully conscious of; understand; be aware of; detect. 

  • To be grateful or thankful for. 

  • To increase in value. 

  • To view as valuable. 

ideate

verb
  • To apprehend in thought so as to fix and hold in the mind; to memorize. 

  • To generate an idea. 

noun
  • The actual existence supposed to correspond with an idea; the correlate in real existence to the idea as a thought or existence. 

adj
  • Produced by an idea. 

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