proffer vs suggest

proffer

verb
  • To offer for acceptance; to propose to give; to make a tender of. 

noun
  • An offer made; something proposed for acceptance by another; a tender. 

suggest

verb
  • To explicitly mention (something) as a possibility for consideration, often to recommend it 

  • To cause one to suppose (something); to bring to one's mind the idea (of something). 

  • To imply but stop short of explicitly stating (something). 

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