What unusual property is shared by the words below?

BROWN

COOK

BEAN

BIRD

BULL

 

HINT:

The same three letters can be added at the end of each word.

 

Answers:

 

When IES is added to each word, the meaning of the word changes:

 

BROWN (a color) - BROWNIES (a sweet treat)

COOK - COOKIES

BEAN - BEANIES

BIRD - BIRDIES (golf)

BULL - BULLIES 

 

Credit: 

Pancho Harrison