different between subsidence vs subsidency

English

Latin subsidens, subsidentis, present participle of subsidere.

subsidence (countable and uncountable, plural subsidences)

The process of becoming less active or severe.
- 1754, William Warburton, Sermon preached before the King, at Kensington, October 27, 1754
  The subdual or subsidence of the more violent passions.
(geology) A sinking of something to a lower level, especially of part of the surface of the Earth due to underground excavation, seismic activity or underground or ground water depletion.

subsidency (countable and uncountable, plural subsidencies)

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