ferments

noun
  1. 1

    Something, such as a yeast or barm, that causes fermentation.

  2. 2

    A state of agitation or of turbulent change.

  3. 3

    A gentle internal motion of the constituent parts of a fluid; fermentation.

  4. 4

    A catalyst.

verb
  1. 1

    To react, using fermentation; especially to produce alcohol by aging or by allowing yeast to act on sugars; to brew.

  2. 2

    To stir up, agitate, cause unrest or excitement in.

Source: https://en.wiktionary.org/wiki/ferment, https://en.wiktionary.org/wiki/ferments