How many words can a pen with half refill write?

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

What Word am I Looking For ?

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the painting?

Which alphabet letter is a question?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

Rumel, A detective who was mere days from cracking an international smuggling ring has suddenly gone missing. While inspecting his last-known location, you find a note:

710 57735 34 5508 51 7718

Currently, there are 3 suspects: Bill, John, and Todd. Can you break the detective's code and find the criminal's name?

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

Two Twins Jack and Jill were standing back to back and suddenly they started running in opposite direction for 4 kilometres and then turn to left and run for another 3 kilometres.

what is the distance between the Baggio twins when they stop ?

Find out the missing number in the picture attached:

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.