decrease vs plummet

decrease

noun
  • An amount by which a quantity is decreased. 

  • A reduction in the number of stitches, usually accomplished by suspending the stitch to be decreased from another existing stitch or by knitting it together with another stitch. See Decrease (knitting). 

verb
  • Of a quantity, to become smaller. 

  • To make (a quantity) smaller. 

plummet

noun
  • A decline; a fall; a drop. 

  • A violent or dramatic fall. 

verb
  • To drop swiftly, in a direct manner; to fall quickly. 

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