Synonyms for Fomenter:

n.

calm, change, inciter, instigator, politics. agitator (noun)
instigator, inciter.
demagogue (noun)
agitator.
fomenter (noun)
agitator.

Other synonyms:

instigator, inciter. Other relevant words:
calm, inciter, instigator, change, agitator, politics.