-ostomy the combining element is properly -stomy

• trapshootings
• trap-stair
• trap stick
• trap sticks
• trapunto
• trapuntos
• trash
• trashcan
• trashcans
• trashed
• trasheries
• trashery
• trashes
• trash farming
• trashier
• trashiest
• trashily
• trashiness
• trashinesses
• trashing
• trashman
• trashmen
• trash talking
• trashtrie
• trashtries