Bone?

[KennyFLA]

I found this in a river near a waterfall in Tennessee.
I don't know if its a fossil of a bone or just a rock, needless to say I don't know much about fossils.
What do you guys think? Do I have more than just an odd rock?
Thanks

(bottom phone is for a size refrence)

 

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[Ninjafossils]

rock