Can You Guess Which Letter Has Been Added?

One extra letter makes a big difference!

For instance, if you add an S, you'll go from a pool to a spool!

pigphoto / Ablestock.com / Via ThinkStock

Keep in mind, one photo could be described by many different words!

pigphoto / Ablestock.com / Via ThinkStock

FOR MORE... Try the previous brain teasers:

EASY: Can You Guess Which Letter Has Been Added? #2

MEDIUM: Can You Guess Which Letter Has Been Added? #3

MEDIUM: Can You Guess Which Letter Has Been Added? #1

MEDIUM: Can You Guess Which Letter Has Been Added #6?

HARD: Can You Guess Which Letter Has Been Added? #5?