Unable To Retrieve Data While Using Between Operator

I came across a weird issue this morning while using Between operator am unable to retrieve data that starts with second option,

Example am using

select * from USER where vendor between 'N' and 'V'

Here I expect to get all the records that has vendor name starting with N,O,P,......U,V

But to my surprise i found am just getting N,O ......,U. I am unable to retrieve vendors start with 'V'

when i use between 'N' and 'W' it shows with 'V' also........but not showing vendors with 'W'

So I doubt whether between is considering second option 'V' or not.