A "large urn" refers to a big vase-like container that can hold a significant amount of something, often used to store or display items like flowers or ashes. Full definition
I'd love to know where you got the two large urns on your buffet? (theinspiredroom.net)
Starting from the front door large urns created by the homeowner's mother display overflowing artistically arranged pine with an added whimsical flare of sticks. (autumndawninspired.com)