You instantiate the parser array:
public static parserclass parser = new parserclass;
but you never instantiate the items inside the class:
for (int i = 0; i < parser.Length; i++)
parser[i] = new parserclass()
A few other notes:
Your code would be much cleaner if you split the line parsing code from code that iterates over the file. (And break it down into sub-tasks generally.
You will also have cleaner code with a generic
, you can add items to these without declaring fixed sized arrays (that might be too small, and are almost definitely too large). The magic number guess  and  is likely to be wrong, unless you know there are 7000 words per line and 1000 lines exactly per file.
Even if you do not use List<t> you should change
string words=new string;
words = input.Split(delimiter);
string words = input.Split(delimiter);
Namespaces and classnames should be in CamelCase in .net.