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Sound is a pressure wave. Objects that "allow" sound to travel through them could be called wave guides.
Insulators- do not let heat through
Yes, it is called radiation.
Refraction
The material through which waves travel is called a medium. This could be a solid, liquid, or gas.
They are called "hormones".
Galaxies that travel together through space are called galaxy groups or galaxy clusters. These are systems of galaxies bound together by gravity.
No, light does not need a substance to travel through. Light can travel through empty space, as it is composed of particles called photons that do not require a medium to propagate.
There are many materials that light can not travel through which are called opaque objects.
By a process called "capillary" action.