Possible Clues:

• Round, hard candy
• Candy store purchase
• American gobstopper — word that's hard to pronounce
• Gobstopper
• ''Worcestershire'' or ''onomatopoeia''
• King or queen beyond rabbit hole? It's hard to say
• Gas container about right for heavy-duty machine
• 'Synecdoche' or 'onomatopoeic,' e.g. (Dental)
• 1999 film starring Rose McGowan, Rebecca Gayheart, and Julie Benz
• Heavy-duty rock-crushing machine