pop-up definition in a layer, how to...

I have a slide with 2 buttons.  Each button causes a layer to appear.  On one of the layers is a word that when hovered over, i would like a definition to appear.  I usually have a layer show on hover that contains the defintion, but when I do so, the first layer (the target of button one) disappears.

any thought on how I can accomplish what I am trying to do?

Thank you for any help you can provide!

Philip 

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