They are both found along the Cascadia subduction zone

Canada is on the North American plate, the eastern part of this plate extends to the mid-Atlantic ridge, however this is far from Canada. The western coast of Canada is a subduction zone for the most part with a small amount of the Queen Charolette fault towards the north. The subduction zone is called the Cascadia subduction zone.

Mount Rainier is a stratovolcano a few hundred kilometers inland of the subduction zone between the Juan de Fuca and North American tectonic plates.

Moun Cleveland formed as a result of a subduction zone, but is not a subduction zone in and of itself.

A subduction zone is a feature that forms volcanoes, not a kind of volcano.

anything can happen at a subduction zone