What do the following words have in common?

DRY
SHY
BED
TALL
CARD
WINNING

HINT:
Each word can be changed into a new one by the addition of the same two letters.

Answer:

The letters OW can be inserted into or added to each word to form a new one.

DOWRY
SHOWY
BOWED
TALLOW
COWARD
WINNOWING

Credit: LA Times Crossword
November 1, 2009
Robert W. Harris
THAT HURTS