Mhhh, actually, you may refer also to shops, restaurants, churches and colleges, etc., using the name or job title of the owner....
So you may say, for example :
"The dentist's are all alongside this street".
But you aren't meaning the "dentists" but the "dentist's offices", I guess...
(But it may still be wrong, I'm not sure, but shouldn't it actually be like "the dentists' offices", since if there is more than one office, there should also be more than one dentist, shouldn't it?)
Anyway, there are also lots of exception with that possessive form :
-every singular noun should take an ['s], like "the doctor's car", so it means that you have to say "Jesus’s words", but you will say "Hercules' labours" because it ends with with an "eez" sound... !!! Same for Ramses or Socrates.
- there is also a special case with the singular proper nouns that are formed from a plural word like "United Nations" which will just take a [']... But if there exists an abbreviation, like GM for General Motors, then it will be "General Motors' bill" but "GM's logo" !!!
-you can't use it with any possessive pronoun (yours, its, hers, etc.)
-you say the "do's, don'ts" but the "ifs, ands, buts" when you're meaning the plurals of those words.
Moreover the ['s] and the ['] are also used to form genitives... Like in "Ladies' lingerie" or in "bikers’ union" or in "children's dreams", ...
The fact is that in certain of those cases you may then use it without the primary noun, like I said upper for "doctor's". ^^
Wikipedia has a nice article :
possessive apostrophe...
It's even more complicated as what I thought.