Do some of the twigs end as pointy but blunt thorn like projections? If it does, it could be one of a species of Sideroxylon. The genus used to be called Bumelia. The most common is Sideroxylon lanuginosum, but it's tough to ID correctly because there are a number of subspecies.
It is very close not all yearlings on the pear tree. will produce thorns at this stage. The main vein on the leaf of the pear tree is green. The underside of the leaf is not a silver color and the leaves are not quite that oblong. The pear tree has a shorter more round leaf. This picture is the Sideroxylon lanuginosum. I am sorry but it is close but I do not agree.
A little backstory about this tree. I did not plant this tree, it started randomly growing in the front of my house very close to the foundation. A withering cherry tree is growing about 7 ft next to it (the cherry tree I did plant).
This tree in question was quite tiny back in early 2011 and I didn't pay attention to it as I thought it was a weed or some sort of offshoot of a small bush next to it. It grew very fast and by the next summer it was huge. It is too close to the house and so I was concerned when I saw it recently and how large it had become.
I do not believe it has flowered and appears to have no projections or any thorns or anything like that . I will be taking more pictures of it on Wed and will post them. I also have an old picture of it from when it was very small back in 2011, not sure if that helps.
This is in CT right on the border of Zone 6a and 6b.