Keep a word, drop a word.

[Jubilate Deo]

Exactly as the title says, keep one word in the pairing and replace the other with something that still makes sense within the context. I'll start.

Apple pie

[Papist]

pie crust

[Jubilate Deo]

pizza crust

[Jack4]

earth's crust

[Jubilate Deo]

thin crust

[Not A Mallard]

wheat thin

[Papist]

thin mints

[Jubilate Deo]

breath mints

[dUSt]

bad breath

[Amppax]

bad coffee

[Not A Mallard]

coffee brandy

[Jubilate Deo]

coffee shop

[Papist]

shop online 

[Jubilate Deo]

shop sign

[Not A Mallard]

sign papers

[Jubilate Deo]

sign language

[Papist]

foreign language  

[Jubilate Deo]

foreign exchange

[Not A Mallard]

gift exchange

[Jubilate Deo]

gift card