What are some nine letter words with 3rd letter A and 4th letter C and 5th letter O and 6th letter D?

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 3 words with the pattern --ACOD---. That is, nine letter words with 3rd letter A and 4th letter C and 5th letter O and 6th letter D. In alphabetical order, they are:

diacodion

diacodium

placoderm