Then why dont the just call it soup.. There must be some difference. Ohh wait lets see what dictionary.com sayss..
stew ( P ) Pronunciation Key (st, sty)
v. stewed, stew·ing, stews
v. tr.
To cook (food) by simmering or boiling slowly.
v. intr.
To undergo cooking by boiling slowly or simmering. See Synonyms at boil1.
Informal. To suffer with oppressive heat or stuffy confinement; swelter.
Informal. To be in a state of anxiety or agitation. See Synonyms at brood.
n.
A dish cooked by stewing, especially a mixture of meat or fish and vegetables with stock.
A mixture likened to this dish.
Informal. Mental agitation: in a stew over the lost keys.
Archaic. A brothel. Often used in the plural.
there must be some difference..