different between infiltration vs groundwater

English

From Middle English infiltracioun, from Medieval Latin infiltr?ti?nem, infiltr?ti?.Morphologically infiltrate +? -ion

infiltration (countable and uncountable, plural infiltrations)

The act or process of infiltrating, as of water into a porous substance, or of a fluid into the cells of an organ or part of the body.
The substance which has entered the pores or cavities of a body.
- 1784, Richard Kirwan, Elements of Mineralogy
  calcareous infiltrations filling the cavities
The act of secretly entering a physical location and/or organization.
- No one should be under any illusions about the objective of the Communist Party leadership: it’s long-term, systematic infiltration of social organisations, media and government. By the time China’s infiltration of Australia is readily apparent, it will be too late.

infiltration (plural infiltrationes)

ground +? water

groundwater (countable and uncountable, plural groundwaters)

Water that exists beneath the earth's surface in underground streams and aquifers.

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