Neither shrub nor tree but an aroid which will die back to a tuber in the winter.

Myrica cerifera can be an attractive shrub/small tree when trained as a standard with the lower limbs removed and then limited to one or more trunks. I can be up to 8 feet tall or more and take on a mushroom shape with periodic pruning. After it has been growing that way for a while you can underplant with something else.

in flower.. a huge tree can reek of the magnificent aroma of wet ugly dirty gym socks.. lol ... btw.. a vast majority of galls are cosmetic in nature ... and in no way harm the tree long term .. i mean really .. their life span is limited to when the leaves fall off .. the cherry themselves are maybe a quarter inch.. and are 95% pit ... and i am pretty sure the birds use them a laxative ... usually using gutters and fence.. etc.. as places to deposit prefertilized seed ... ken

Cherry, probably chokecherry