Freedom

Both wars were initiated by the monarchies in question and inspired by Enlightenment ideas, and the French Revolution was, in large part, inspired by the American Revolution. (Ironically enough, the French absolute monarchy had helped finance the revolt of the American colonists against perceived monarchical excesses . . . and the debt thus incurred was part of the snowballing problems that led to the French Revolution.)
The two wars differ in some key ways:
-- The American Revolution was a revolt of colonies against an overseas king, while the French Revolution was a revolt of the lower classes within their own country. 

-- The goals of the American Revolution remained more or less the same from beginning to end, while the goals of the French Revolution changed, becoming more radical over time. 

-- The American Revolution resulted in two separate states which have essentially retained those forms of government since, while the French Revolution brought a succession of governments to France.

The American Revolution was also not as violent as the French Revolution. French Revolutionaries (after storming the Bastille to start the Revolution) would execute any supporters of the king via the guillotine, whereas American
Revolutionaries were never violent towards Brits or supporters of the monarchy outside of warfare. 

The American Revolution was fought primarily in North America and the French Revolution was fought primarily in Europe. 

The American Revolution was fought primarily against the United Kingdom, the French Revolution was fought against the French government under King Louis XVI and various European Coalitions. 

Native Americans fought on both sides during the American Revolution but they did not fight during the French Revolution. 

Both Revolutions overthrew the legitimate Monarchs and both were long and bloody.

French revolution Time line:
October 18, 1598- Henry IV made a law allowing religious tolerance called the Edict of...