Quote: Scepter=any hammer-like object that can have Paladin skills on it. Maces=all blunt instruments that are not wands(have Necro skills) or staves(Sorc skills) or orbs(ditto staves)
Very wrong.
Scepter: 1-hand weapon that can have Paladin staffmods
Wand: 1-hand weapon that can have necromancer staffmods
Staff: 2-hand weapon that can have sorceress staffmods
Rod: all of the above
Club: club, spiked club, exceptional/elite versions of these
Hammer: war hammer, maul, great maul, exceptional/elite versions of these
Mace: mace, morning star, flail, exceptional/elite versions of these
Blunt weapons: all of the above; can be characterized as weapons with the innate +50% undead damage bonus; all blunt weapons work with mace mastery
Sorceress orbs aren't a subset of any of these. They aren't blunt weapons. They aren't even mêlée weapons (for purposes of affixes, runewords, etc.).
As for the "maces can have +Druid skills on them" bit...
No weapons have have druid staffmods. There are random affixes that give +druid skills or +druid skilltabs, but the only weapons that can have these are clubs.