Plugin Request – Replace String

I use stock phrases in my website, and for consistency sake, want the stock phrases to be the same on every page or post I write.

Is there a plug that would allow me to point to stock phrasing and have it displayed every time it’s pointed to in a post or page.

For instance $businesshours would display our business hours or $services would list the services we offer, or $address would display the office address.

Thanks!