A-Z doubleact.

[Dreamermec]

Undo & redo

 

[Arachne]

zip and unzip

 

[Dreamermec]

After U comes V

Value & cost

Next letter W

 

[gabriel20]

Wave and wavemaker(synonym of agitator,one who stirs up trouble).

 

[user 108508]

X-ray and film

 

[Dreamermec]

Yawn & sleep

 

[gabriel20]

Zebra & crossing

 

[user 108508]

always and forever

 

[ABrokenMan]

Burt Bacharach & Hal David (sorry, young 'uns, you might require goole)

 

[user 108508]

cat and mouse

 

[Dreamermec]

Dear & near

 

[user 108508]

ebb and flow

 

[ABrokenMan]

for and against

 

[Minus]

going and coming

 

[Arachne]

Hot and Cold

 

[ABrokenMan]

In and Out

 

[user 108508]

Jack and Jill

 

[ABrokenMan]

Kiss and Tell

 

[user 108508]

lemon and lime

 

[Dreamermec]

Men & women