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
fdsdgdg
They make a trick question.
Fire
they all have vowels
Organize
e
They all start with "D".
water
flowers
They all rhyme
They are all parts of a horse.