commend vs heap on

commend

verb
  • To mention by way of courtesy, implying remembrance and goodwill. 

  • To recommend. 

  • To entrust or commit to the care of someone else. 

  • To praise or acclaim. 

  • To congratulate or reward. 

heap on

verb
  • To give someone a lot of something (advice, praise, insults, etc.), especially more so than they can handle or is appropriate 

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