The voice actors in "Xenosaga" pronounce A.G.W.S in the following ways:
A.G.W.S. are key figures in the Xenosaga series. An A.G.W.S. is esentially a machine designed to combat Gnosis. While this technically makes KOS-MOS an A.G.W.S (she even calls herself an A.G.W.S.), what are generally described as A.G.W.S are the mechwarrior-type A.G.W.S. that bear the name and can be used in battle.
*Shion disappears and her A.G.W.S. unit appears*
Gundam Wing, eat your heart out.