What do the following words have in common?

PIT

CAP

BAR

RAY

CAN

SAX

FLAG

 

HINT:

DRAG could be added to the list.

 

Answer:

 

The letters ON can be added at the end to make new words:

 

PITON

CAPON

BARON

RAYON

CANON

SAXON

FLAGON

(DRAGON)