C++ cannot convert parameter 1 : Function Problem... (urgent )

Hi
here is my code :

in my main() :

string TypeWord ;
 int plen ;
 cin >> TypeWord;
 plen = TypeWord.length();
 cout << plen;

if (VerifyWord(TypeWord,plen)) // here is my mistake
{
cout << TypeWord << " is in tree ";
}
else {
cout << TypeWord << "is not in tree." ;
}
               
here is my function VerifyWord :

bool VerifyWord(const char * word, int len)
{
  int plen;
  Dictio * n = root -> follow(word,len,plen);
  return (plen == len && n -> IsFullWord());
}          
     
here is my error :
'VerifyWord' : cannot convert parameter 1 from 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' to 'const char *'

i know i wont convert cause its not the same but i cant make it work
i type a word and i check if its in my tree.
how can i make my CIN<< TypeWord ... word

need an answer