How about these words/euphemisms for diaper:
MAG (nasa -- Maximum Absorbency Garment)
Padding
Protection
Incontinence Pants (as used by Futuro, circa 1975)
Protective/absorbent underwear
Waterproof pants
And of course, brand names: Depends, Attends, Molicare, Abena M4s, Bambinos, etc! (But not Poise--that's garbage!)