What are some nine letter words with 4th letter A and 6th letter T and 7th letter O and 9th letter N?

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern ---A-TO-N. That is, nine letter words with 4th letter A and 6th letter T and 7th letter O and 9th letter N. In alphabetical order, they are:

allantoin

hydantoin