NOTHING! "Roach" Is just another (probably informal) term for cockroach. Just like Soap Operas are often called "soaps".
There is no difference. A water bug is a type of cockroach. It is different from the more common American Cockroach, which is why some people claim it is not a roach.
COCKROACH
I have heard people refer to them as "cockies." But actually, "roach" is a nickname for cockroach.
One difference between a roach and a beetle is that the roach has membranous wings and beetles do not. In addition, roaches do not have the hardened forewings like the beetle.
roach killa: A COCKROACH KILLER, is an exterminator who specializes in killing roaches
A flying cockroach is a roach with wings.They live in Mexico and other places like that.
Roach means Cockroach (some of the people who have dirty minds will laugh at that) , and a cockroach can live many days without its head
if it is flying ,it is a mature cockroach if it not flying it may be a mature cockroaches or a nymph (immature)
A baby cockroach looks like a cockroach but smaller. a baby butterfly is a caterpillar.
idk ... roach or a cockroach or something?
A newly hatched cockroach is called a nymph.
A cockroach is normally known as a cockroach throughout the world. However, please provide details about which country or region you are asking about. In USA it is often called "roach" (Slang for cockroach).