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The Simple English Wikipedia has an article on:

Pronunciation change

Noun change

Singular
mortar

Plural
mortars

  1. (countable) A mortar is kind of large gun that fires explosive shells.
  2. (uncountable) Mortar is a type of paste used to stick bricks together.
  3. (countable) A mortar is a bowl used with a pestle to crush food or drugs into smaller pieces.