-ostomy the combining element is properly -stomy

• stade
• stades
• stadholder
• stadholders
• stadia
• stadia hairs
• stadial
• stadia lines
• stadials
• stadia rod
• stadias
• stadium
• stadium rock
• stadium rocks
• stadiums
• stadtholder
• stadtholders
• staff
• staffage
• staffages
• staff college
• staff colleges
• staff corps
• staff duties
• staff duty