The difference is that most cities won't have both Azure Street and Azure Bluff, and if you address mail to 2245 Azure Street, it'll probably arrive at 2245 Azure Bluff.
Tell that to NYC. We have numbered streets. We have the same numbered street in a Street, Road, Drive, Terrace, and Avenue designation. Sometimes within a block of each other. Here in Queens, you can drive north along 23rd St and cross 23rd Terrace, 23rd Dr, 23rd Rd, and then 23rd Ave.
No idea about most cities, but my city (Veliky Novgorod, a relatively small town in Russia with mere 200K population and 90 km.sq. in size) has lots of such cases. Voskresenskii lane and Voskresenskii boulevard; Orlovsakya street, Orlovskii lane and Orvovskii passage and so on - all are distinct addresses, some located in very different parts of the city.
Out of 300 ways extracted from address database I see about 40 entries (counted by hand, too lazy to build a proper query) being very alike. Luckily, most names decline and "street" and, say, "boulevard" have different grammatical gender, so it's harder to make a mistake.
Try doing some geoprocessing once in a while: this is not an unusual quirk out IRL, and is one big PITA for delivery:
address says "Sokolska 20". Okay, let's guess from the other metadata that the city is actually "Prague" and not "Ostrava". No such house number at this address, perhaps should have been "sokolOVska 20, Prague"? Wonderful, that exists, solv- oh wait, do we have two different houses with the same house number? We do, multiple clicks apart, and both are legally correct.
In other words, that's a very good example you've used, exactly because it shows the underlying assumptions as faulty.
And then there's the concept of 'vanity addressing', though usually negated by postcodes/zipcodes - where affluent/"good" suburb is adjacent to a "less desirable" one - I'm not familiar with the geography, but for example where someone might say Beverley Hills, but give/live in Culver City's ZIP. Or in Melbourne, when I worked for a utility we'd get a lot of people who'd quote their address as Mont Albert, with a Box Hill South post code.
