Here's the latest word puzzle from NPR Sunday On-air Challenge! Find the commonalities among given words!

I'm going to name three things. You tell me something they all have in common.

 

Ex. Telephone, Saturn, tree stump   -->   RINGS

 

1. Guitar, tennis racket, marionette

 

2. Sewing kit, bowling alley, ATM

 

3. Tennis tournament, arsonist, dating app

 

4. Painting, bowling, glasses

 

5. Canal, safe, head of hair

 

6. Car trunk, deck of cards, the film "Titanic"             

 

 

 

ANSWER KEYS

1.  strings

2.  pins

3.  matches

4.  frames

5.  locks

6.  jack