To count all of the words that appear in an image for indexing purposes, you need to get each OcrWord object to retrieve their Text properties. This can be accomplished using this code:

C#

Dictionary Words;
private void GatherWords(Atalasoft.Ocr.OcrPage ocrPage)
{
    Words = new Dictionary();
    foreach (OcrRegion region in ocrPage.Regions)
    {
        OcrTextRegion textregion = region as OcrTextRegion;
        if (textregion != null)
        {
            foreach (OcrLine line in textregion.Lines)
            {
                foreach (OcrWord word in line.Words)
                {
                   if (Words.ContainsKey(word.Text))
                   {
                        Words[word.Text]++;
                   }
                   else
                   {
                        Words.Add(word.Text, 1);
                   }
                }
            }
         }
    }
}

VB.NET

Private Words As Dictionary(Of String, Integer) 
Private Sub GatherWords(ByVal ocrPage As Atalasoft.Ocr.OcrPage) 
    Words = New Dictionary(Of String, Integer)() 
    For Each region As OcrRegion In ocrPage.Regions 
        Dim textregion As OcrTextRegion = TryCast(region, OcrTextRegion) 
        If textregion IsNot Nothing Then 
            For Each line As OcrLine In textregion.Lines 
                For Each word As OcrWord In line.Words 
                    If Words.ContainsKey(word.Text) Then 
                        Words(word.Text) += 1 
                    Else 
                        Words.Add(word.Text, 1) 
                    End If 
                Next 
            Next 
        End If 
    Next 
End Sub

Original Article:
Q10244 - HOWTO: OCR to get the total number of each word in a image