Some 8 letter word with 2 Ds and 2 Ss are:
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern -I-SS--A. That is, eight letter words with 2nd letter I and 4th letter S and 5th letter S and 8th letter A. In alphabetical order, they are: piassaba piassava
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern ----DS-. That is, seven letter words with 5th letter D and 6th letter S. In alphabetical order, they are: couldst wouldst
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern M--SS---. That is, eight letter words with 1st letter M and 4th letter S and 5th letter S. In alphabetical order, they are: moussaka moussing
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern --B---SS-. That is, nine letter words with 3rd letter B and 7th letter S and 8th letter S. In alphabetical order, they are: babirussa nobilesse
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern D-----SS-. That is, nine letter words with 1st letter D and 7th letter S and 8th letter S. In alphabetical order, they are: demitasse dogaressa
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern ----SS--D. That is, nine letter words with 5th letter S and 6th letter S and 9th letter D. In alphabetical order, they are: gneissoid tayassuid
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern C-----SS-. That is, nine letter words with 1st letter C and 7th letter S and 8th letter S. In alphabetical order, they are: chaprassi chuprassy
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern -AM----SS. That is, nine letter words with 2nd letter A and 3rd letter M and 8th letter S and 9th letter S. In alphabetical order, they are: campiness hamminess
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern A--A---DS. That is, nine letter words with 1st letter A and 4th letter A and 8th letter D and 9th letter S. In alphabetical order, they are: alkaloids autacoids
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern A--SS---E. That is, nine letter words with 1st letter A and 4th letter S and 5th letter S and 9th letter E. In alphabetical order, they are: amassable amissible
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern A--SS---S. That is, nine letter words with 1st letter A and 4th letter S and 5th letter S and 9th letter S. In alphabetical order, they are: abessives adessives
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern -IR--SS. That is, seven letter words with 2nd letter I and 3rd letter R and 6th letter S and 7th letter S. In alphabetical order, they are: airless kirmess