What do the following words have in common?

FUR
PROW
PASTE
DRIVE
SHOVE
GROVE

HINT:
The same letter will change each word into a new one.

Answer:

Each word can be followed by the letter L to make a new word:

FURL
PROWL
PASTEL
DRIVEL
SHOVEL
GROVEL

Credit: Will Shortz
NPR Weekend Edition Sunday Puzzle 
June 5, 2010 - PEARLS OF WISDOM