What do the following four-letter words have in common?

ABLE

ACME

ADZE

ELAN

EVIL

GORE

ODOR

 

Answer:

 

Each word becomes a new one when you reverse the first two letters:

 

ABLE - BALE

ACME - CAME

ADZE - DAZE

ELAN - LEAN

EVIL - VEIL

GORE - OGRE

ODOR - DOOR