Although I agree with Percy and cavediver that the two "differences" were very strange aspects to highlight, I did find this portion of the source very helpful in amplifying the difference between light and sound in my mind:
Vacate's Light vs Sound source writes:
Although both are forms of wave motion, sound requires a solid, liquid, or gaseous medium [vibrations in matter]; whereas light travels through empty space [via the flight of photons]. The denser the medium, the greater the speed of sound. The opposite is true of light. Light travels approximately one-third slower in water than in air. Sound travels through all substances, but light cannot pass through opaque materials.
[bracket-thoughts added by me]
I especially like how it talks about the difference of increasing/decreasing velocity in various mediums. That shows a distinct fundamental difference between light and sound. Although, I suppose it certainly lacks describing what that fundamental difference specifically is
Or is there anything in there that's also very wrong?