If you like things really neighborly, you have to live in a neighborhood, which is not at all like a subdivision. The houses are close together, so people get to know each other. Neighborhood people have the keys to each other's houses, are generally welcome to yell at each other's children, and socialize among themselves. A lot of Nashville neighborhoods have neighborhood associations, which do things like clean neighborhood alleys and parks, plant neighborhood trees, and fight egregious zoning changes. Neighborhoods are where you live if you plan to stay a while.
Subdivisions are the modern or near-modern developments that ring the city.
Subdivision houses have two-car garages, often with the garage door facing the street. Usually there are no sidewalks, and the trees are small. Subdivision people tend to leave town for holidays. Subdivisions are where you live if you don't plan to stay a while. There are some subdivisions in Davidson County, but most are just across the county line.