Assuming that the thumb is your first finger, the index finger your second, and so on to the pinkie your fifth, here are the words in which each character typed on a qwerty typewriter keyboard by your nth finger appears precisely n times in the word.
"Counting With Your Fingers,"
Word Ways: Vol. 37
, Article 16.
Available at: http://digitalcommons.butler.edu/wordways/vol37/iss3/16