<<The two forms can have different meanings. For instance, "the bottom of the barrel" refers to inside the barrel, at the bottom, while "the barrel's bottom" refers to the outside of the barrel. >>
True, they can have slightly differing primary connotations, but "the barrel's bottom" can also refer to the inside as well. It's just usage that dictates that in most falls it refers to the outside.
Likewise, "bottom of the barrel" can mean the outside too. There is no rule.
True, they can have slightly differing primary connotations, but "the barrel's bottom" can also refer to the inside as well. It's just usage that dictates that in most falls it refers to the outside.
Likewise, "bottom of the barrel" can mean the outside too. There is no rule.