Which fur should we be getting from the Lion?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

What has many teeth, but cannot bite?

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.

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

What has one eye, but can’t see?

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

There are 3 apples in the basket and you take away 2. How many apples do you have now?

A bank customer had $100 in his account. He then made 6 withdrawals. He kept a record of these withdrawals, and the balance remaining in the account, as follows:

Withdrawals Balance left
$50 $50
$25 $25
$10 $15
$8 $7
$5 $2
$2 $0
----- -----
$100 $99

Why are the Totals not tallying?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?