The same three letters, in the same, consecutive order, can be added somewhere in the words below to form new words.

AD
COD
DEN
FORD
RANT

HINT:
This puzzle was dedicated to John Lennon in tribute to his song Give Peace a Chance.

Answer:

The letters WAR can be added to the clue words to form new ones:

AWARD
COWARD
WARDEN
FORWARD
WARRANT

Credit:
Richard Silvestri
GIVE PEACE A CHANCE