I think the answer you want is pyogenesis, purulent, or suppuration. The word parts pyo- and -pur- can both mean pus.A rather disgusting mnemonic for remembering this a zombie has come home to his mother because she has baked him his favorite. Pure (-pur-) pus pie. Oh (pyo-) boy, yummy.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern PY-G------. That is, ten letter words with 1st letter P and 2nd letter Y and 4th letter G. In alphabetical order, they are: pyogeneses pyogenesis