Determine if a word is on the list

#include <iostream>
#include <string>
#include <vector>
using namespace std;

// Determine if a word is on the list.

// This function returns true if the
// strings match. Otherwise false.
bool is_on_list(string word, vector<string>& word_list)
{
    // Check each item on the list.
    for (string current_word : word_list)
    {
        // If the word matches,
        if (current_word.compare(word) == 0)
        {
            // The word is on the list.
            return true;
        }
    }

    // Otherwise, the word does not match.
    return false;
}

int main()
{
    string input; // This is the input.
    vector<string> list_of_words = {"cat", "dog", "bird"};

    cout << "Enter an animal (lowercase):" << endl;
    cin >> input; // Get the user's input.

    // If the word is on the list.
    if (is_on_list(input, list_of_words))
    {
        cout << input << " is on the list." << endl;
    }
    else // Otherwise if the word is not on the list,
    {
        cout << input << " isn't on the list." << endl;
    }

    return 0;
}