A block is usually the distance between two streets. I've counted about 13 different words that all mean street or road; there is no real difference between them, except that a street is generally in a developed area and a road is more in a rural area; but it's not incorrect to use "road" in a developed place, except for when calling it by its name (if it's named, for example, Main Street, you wouldn't use "road" here; unless you wanted to caution someone from oncoming traffic "Stay out of the road", or something; you could also use street there too.)

Oxford English Dictionnary gives the following meaning : Street: Public road in a city or town that has houses and buildings on one side or both sides. Road : A hard surface built for vehicles to travel on. Block : Group of buildings with streets on all sides.

Make sure you don't forget: Avenue, Lane, Way, Highway, Thruway, Freeway, Boulevard, Circle and Overpass. Who says English was easy?

street may refer to a road with shops or buildings on either side, especially in urban area, not apply to those in the wild or countryside.