Buzztitution 

An animal, particularly a dog, that temporarily fills the void in the heart of a dog owner when they are required to be away from their loyal friend from an undetermined amount of time.

"Can I come play with Nigel today? I really need a buzztitution for my pup back home."

Buzztitution by Patches414 December 14, 2016

Bustitutionalize 

To have to live in a converted bus, specifically a school bus, more specifically a short bus.

She lived in the short bus for so long she couldn't even imagine living in any other type of dwelling. She had become bustitutionalized.

Bustitutionalize by Miss Reclusive February 5, 2010

bustitution 

Any replacement or substitution of rail service with bus transit, whether permanent or temporary. Often used to reflect an inferior quality of service.

Due to track construction on the Red Line at the Charles/MGH stop, there will be bustitution this weekend between Kendall and Park Street,

bustitution by Andrew Schwartz November 1, 2006