impregnate vs infuse

impregnate

verb
  • To saturate, or infuse. 

  • To fill pores or spaces with a substance. 

  • To fertilize. 

  • To cause to become pregnant. 

infuse

verb
  • To instill as a quality. 

  • To inspire; to inspirit or animate; to fill (with). 

  • To steep in a liquid, so as to extract the soluble constituents (usually medicinal or herbal). 

  • To cause to become an element of something; to insert or fill. 

  • To undergo infusion. 

  • To make an infusion with (an ingredient); to tincture; to saturate. 

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