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

What Word am I Looking For ?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

Rebus Puzzle Definition: A rebus is an illusion device that uses pictures to represent words or parts of words.
What does This Rebus Puzzle Identify?

You walk into a room and see a bed. On the bed, there are two dogs, five cats, a giraffe, six cows, and a goose. There are also three doves flying above the bed. How many legs are on the floor?

What do the following words have in common?

Assess
Banana
Dresser
Grammar
Potato
Revive
Uneven
Voodoo

Can you find out the missing number in the grid?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

What is black when you buy it, red when you use it, and gray when you throw it away?