Not of children under 14 - around 700 children under 14[1] die from drowning in swimming pools, lakes, etc (non-boating accidents). Also according to the CDC[2], around 400 children in the 0-14 age range[3] die per year from all firearm related incidents. This includes suicides, homicides, and unintentional shootings.
IIRC, when I was looking this up a few months ago, there's a sharp jump in homicides by handgun around age 17.
Not to mention that guns are actually meant to kill things (usually; some guns aren't, even if they're still capable of doing so), unlike pretty much all swimming pools (that I know of; I'd be concerned if there were swimming pools designed to kill things). Comparing pools to guns (or cigarettes, for that matter) is a stretch on the scale of at least 27 slinkies.
What? Guns cause over 3 times as many deaths as drowning.