different between overcrowding vs overpopulation

English

overcrowding

overcrowding (countable and uncountable, plural overcrowdings)

The situation where a space holds more occupants than it can comfortably accommodate.
- 1846, Thomas Campbell Foster, Letters on the Condition of the People of Ireland (page 270)
  […] there are sublettings, overcrowdings of lands, clearances, and emigrations going on; and want of employment, with consequent destitution and wretchedness is the complaint of the majority of the inhabitants.

From over- +? population. Compare overpopulous and overpopulate.

overpopulation (countable and uncountable, plural overpopulations)

A situation which occurs when the number of occupants of an area exceeds the ability of that area to provide for those occupants.

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