ferment

noun

1.
a state of agitation or turbulent change or development
seethe agitation fermentation tempestuousness unrest
2.
a substance capable of bringing about fermentation
Derived from:
ferment
3.
a process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol
yeasting fermentation fermenting zymolysis zymosis
Derived from:
ferment