Vice & Vise

With a C – a habit deemed inappropriate or immoral, often used to describe gambling, drinking, or sexual depravity (or as I like to call it: Tuesday).
With an S – a clamping tool used to hold an object still while it is worked upon.

Coop & Coupe

Coop – a small living space built for birds such as chickens or pigeons.
Coupe – a two-door car with a fixed roof.
One of my all-time favorite jokes: Why does a chicken coop have two doors? Because if it had four, it would be a chicken sedan.

Altar & Alter

With an A – (n.) a table or platform used for religious ceremonies and sacrifices.
With an E – (v.) to make something different than it was.

Frankly, though, I hope this doesn't come off like I'm advocating for either side. Maybe I should go back to Olympic themed posts. :)

One & Won

In the Olympic spirit, we present:

Go, Jamaica!