John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

Consider this about a word: The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

Why is a river so rich ?

What is the last thing you take off before bed?

What has a ring but no finger?

A blonde put eyeliner on her head. Why?

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.

Buy me, smell me or deliver me, I do not change.

Who am I?

Rearrange the letters in "new door" to make one word.