Answer: Sumac shrub and tree are really the same thing, just the tree form has a central leader and the "shrub" has multiple leaders. To remove the dead elm stump, I'd hire a landscaper with a stump grinder to grind out the roots as mnuch as possible. Then keep diligently cutting back the sprouts to eventually kill the roots.There are commercial products such as "Stump Remover" available at garden centers that might be worth a try. I'd guess they work over a long period of time.
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