lop vs porpoise

lop

verb
  • To hang downward; to be pendent; to lean to one side. 

  • To allow to hang down. 

  • To cut off as the top or extreme part of anything, especially to prune a small limb off a shrub or tree, or sometimes to behead someone. 

noun
  • That which is lopped from anything, such as branches from a tree. 

  • Any of several breeds of rabbits whose ears lie flat. 

  • A flea. 

porpoise

verb
  • Said of an aircraft: to make a series of plunges when taking off or landing; or of a watercraft: to successively plunge up and down in the water. 

  • Said of an air-breathing aquatic animal such as a porpoise or penguin: To repeatedly jump out of the water to take a breath and dive back in a continuous motion. 

noun
  • Any small dolphin. 

  • A small cetacean of the family Phocoenidae, related to dolphins and whales. 

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