Using Variables to populate a list

Ok I've done a bit of searching but haven't found anything so far. 

Here's what I'm trying to do: I have 5 items on a slide, when a word pops up you have to drag it to the item you think it belongs in (there is no right or wrong) this happens a few times and then the next slide will display a list of the words you put in each item. 

Currently I have a variable called "item 1", "item 2", "item 3", etc... and a variable called "word 1", "word 2" etc. When you drag word 1 onto item 1 the variable changes to "item 1" or whichever item you drag the word on.

I'm not sure where to go from there. I don't know how to display words associated with items based on these variables. 

Any help would be appreciated.

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