a circus
A large circus tent is called normally called Marquee
The big fat end point
cerebrum
It is called an improper or vulgar fraction. Or, for obvious reasons, a top-heavy fraction.
The button on top of a hat is called a "top button" or a "crown button." It is a decorative feature that can also be functional in some hats.
That is called a tent.
the bear looks like a dipper.
The hills were called Big Round Top and Little Round Top and are the most famous of the hills at Gettysburg.
the big one
The Great Bell is Big Ben ! It is in the Clock Tower which is also called Big Ben.
really big
A cumulus cloud looks like a big piece of floating cotton. They are mostly flat in the bottom and the top has rounded towers. They are also called towering cumulus.