plash vs slack

plash

noun
  • A small pool of standing water; a puddle. 

  • A splash, or the sound made by a splash. 

  • A sudden downpour. 

  • The branch of a tree partly cut or bent, and bound to, or intertwined with, other branches. 

verb
  • To cut partly, or to bend and intertwine the branches of. 

  • To splash or sprinkle with colouring matter. 

  • To cause a splash. 

  • To bend down a bough (in order to pick fruit from it). 

  • To splash. 

slack

noun
  • A tidal marsh or shallow that periodically fills and drains. 

  • Unconditional listening attention given by client to patient. 

  • A temporary speed restriction where track maintenance or engineering work is being carried out at a particular place. 

  • The part of anything that hangs loose, having no strain upon it. 

  • Small coal; coal dust. 

  • A valley, or small, shallow dell. 

adv
  • Slackly. 

verb
  • To slacken. 

  • To lose cohesion or solidity by a chemical combination with water; to slake. 

adj
  • Moderately warm. 

  • Vulgar; sexually explicit, especially in dancehall music. 

  • Not active or busy, successful, or violent. 

  • Excess; surplus to requirements. 

  • Lax; not tense; not firmly extended. 

  • Lacking diligence or care; not earnest or eager. 

  • Lax. 

  • Moderate in speed. 

  • Weak; not holding fast. 

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