Convulsion
Part of speech: noun
Definition: An intense, paroxysmal, involuntary muscular contraction. An uncontrolled fit, as of laughter; a paroxysm. Violent turmoil.
Turmoil
Part of speech: noun
Definition: chaosdisorder
Example sentence: Owning a variety of asset classes means that some part of your portfolio will be doing well when the cyclical turmoil arises. A broadly diversified portfolio includes large capitalization stocks, small cap, emerging markets, fixed income, real estate and commodities.