81 x 9 = 801. What must you do to make the this equation true?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

If Japan and Panama decided to merge into a single country, probably people will name it Japanama.

Can you think of two more such country's unions that could produce similar names like Japanama by overlapping their three letters?

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

Which Travels Faster? Solve below famous picture riddle:

What begins with T, ends with T, and has T in it?

Prove that the below maths equation is true.

8 + 8 = 91

There was a strange boy who was born before his father. How can this be possible?

Why is the longest human nose just 11 inches?

Which wheel of car does not rotate when you turn your car right?