Odd Tree

I am wondering if anyone can help me identify a tree or what acts like a tree.  It is growing with so trees we have been using as an research project.  The red bud it is planted with is about 1 foot tall and this one is about 5 feet.  It has grown that much in a year.

I will send a photo if you know what it is leave me a message in the comments.

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You can see the red bud next to it so this is the size difference in the same soil and the same care.