WORDPLAY

HOW REVOLTING!

Joseph Appel

[Note from JA: This puzzle was posted on November 6, 2014. It was published in GAMES/World of Puzzles in the April, 2015 issue. I did not remember it, and was very surprised when - in randomly reviewing this issue - I saw it. Why do I mention this? Because I couldn't solve my own puzzle! I guess this means two things: It's a good puzzle, and I'm losing it.] Can you solve it?

What do these six letter pairs have in common?

BO     LA

CO     RO

DO     TO

Answer:

 

Each pair can be followed by the letters UGH:

 

BOUGH     LAUGH

COUGH     ROUGH

DOUGH     TOUGH