What do the following words have in common?

GREED
TRAIN
BLOUSE
GROUSE
GRUBBY
CORDIAL
OUTLIVE
BESIEGE

HINT:
Drop two letters from each word.

Answer:

Dropping two letters from each word will leave a color:

RED
TAN
BLUE
ROSE
RUBY 
CORAL
OLIVE
BEIGE

Credit: Will Shortz
NPR Weekend Edition Sunday Puzzle
SEEING RED - Jan. 20, 2008