ooze vs sludge

ooze

noun
  • A piece of soft, wet, pliable ground. 

  • Tanning liquor, an aqueous extract of vegetable matter (tanbark, sumac, etc.) in a tanning vat used to tan leather. 

  • Soft mud, slime, or shells especially in the bed of a river or estuary. 

  • A pelagic marine sediment containing a significant amount of the microscopic remains of either calcareous or siliceous planktonic debris organisms. 

  • An oozing, gentle flowing, or seepage, as of water through sand or earth. 

verb
  • To give off a strong sense of (something); to exude. 

  • To be secreted or slowly leak. 

sludge

noun
  • A mass of small pieces of ice on the surface of a body of water. 

  • A residual semi-solid material left from industrial, water treatment, or wastewater treatment processes. 

  • Solids separated from suspension in a liquid. 

  • sludge metal 

  • A sediment of accumulated minerals in a steam boiler. 

verb
  • To slop or drip slowly. 

  • To slump or slouch. 

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