on top
• on the highest point or uppermost surface.
• "a woollen hat with a bobble on top"
• in a leading or the dominant position.
• "United were on top for most of the first half"
• in addition.
• "the price was £75, with VAT on top"
on top of
• on the highest point or uppermost surface of.
• "a town perched on top of a hill"
• in command or control of.
• "he couldn't get on top of his work"
• in addition to.
• "on top of everything else he's a brilliant linguist"
• in close proximity to.
• "we all lived on top of each other"