These words are related to storage or a collection of items. "Many" refers to a large quantity, "stacks" can refer to a pile of objects, "heap" also refers to a large pile, and "auction" involves a collection of items being sold to the highest bidder.
bars
They make a trick question.
Fire
they all have vowels
Organize
e
flowers
They all rhyme
They all start with "D".
Some words with the root "auct" are auction, auctioneer, and auctioning.
they all rhyme :D
Car hop, sidecar, carpet