Why does this program run into a segmentation fault?

Question

I am making a program that loads a wordlist, then uses a function to find anagrams of an input word in the wordlist. I add these words to a vector.

#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>

int main()
{
    vector<string> words;
    vector<string> anagrams;
    string inputWord;
    words=loadWordlist("wordlist.txt");
    cout << "Find single-word anagrams for the following word: ";
    cin >> inputWord;
    anagrams = anagram(inputWord, words);
    for (int i=0; i<anagrams.size(); i++)
    {
        cout << anagrams[i] << endl;
    }
    return 0;
}

vector<string> loadWordlist(string filename)
{
    vector<string> words;
    ifstream inFile;
    string word;
    inFile.open(filename);
    if(inFile.is_open())
    {
        while(getline(inFile,word))
        {
            if(word.length() > 0)
            {
                words.push_back(word);
            }
        }
        inFile.close();
    }
    return words;
}

bool isAnagram(string word1, string word2){
    int n1=word1.length();
    int n2=word2.length();
    
    if(n1!=n2){
        return false;
    }
    
    sort(word1.begin(), word1.end());
    sort(word2.begin(), word1.end());
    
    for(int i=0; i<n1; i++){
        if(word1[i]!=word2[i]){
            return false;
        }
    }
    return true;
    
}

vector<string> anagram(string word, vector<string> wordlist)
{
    vector<string> anagramList;
    string compareWord;
    int size=wordlist.size();
    for(int i=0; i<size; i++){
        compareWord=wordlist[i];
        if(isAnagram(word, compareWord)==true){
            anagramList.push_back(compareWord);
        }
    }
    return anagramList;
}

The program is supposed to take an included text file(wordlists.txt) and create a vector of strings using the words from the list. It then uses this list of words and compares each word to a inputted word to check if they are anagrams. If they are anagrams, then the word from the wordlist is then added to the vector anagramList

I dont get a line number when it returns the fault, but I am sure the issue is somewhere in my anagram function. I always have issues with using vectors and trying to access their values, so any help is appreciated.