If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?

What came first, the chicken or the egg?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

When monkey rotate the gear, which mark will be hit 1 or 2 ?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?