compliment vs recommend

compliment

verb
  • To pay a compliment (to someone); to express a favourable opinion (of someone). 

noun
  • An expression of praise, congratulation, or respect. 

  • Complimentary language; courtesy, flattery. 

recommend

verb
  • To bestow commendation on; to represent favourably; to suggest, endorse or encourage as an appropriate choice. 

  • To make acceptable; to attract favor to. 

  • To advise, propose, counsel favorably 

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