relax vs toil

relax

verb
  • To become loose. 

  • To become less severe or tense. 

  • To make something (such as codes and regulations) more lenient. 

  • To calm down. 

  • To relieve (something) from stress. 

  • To make something less severe or tense. 

  • To make something loose. 

  • To become more lenient. 

toil

verb
  • To struggle. 

  • To labour; work. 

  • To weary through excessive labour. 

  • To work (something); often with out. 

noun
  • Trouble, strife. 

  • Labour, work, especially of a grueling nature. 

  • A net or snare; any thread, web, or string spread for taking prey. 

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