Is friction a reaction force?

No. * A reaction force is always exerted on another object (usually the one exerting the force) rather than the one on which the original force is applied. read more

A reaction force is always exerted on another object (usually the one exerting the force) rather than the one on which the original force is applied. But in the case of friction, often, the object on which the force is applied, starts moving and the friction acts on that same body opposing its motion. read more

Action force and reaction force are applied to two different bodies. The two bodies that are interacting. So if you push on the block, the block pushes onto you with the same force. If there is friction acting from table onto block, there is friction acting from block onto table. read more