Mammoth Uncensored Word List:
16 - 20 letter words starting with ph

phacoemulsifications pharmacoepidemiology phenylpropanolamines phenylthiocarbamides philoprogenitiveness phosphatidylcholines phosphatidylinositol phosphoenolpyruvates phosphofructokinases phosphomonoesterases photoautotrophically photodisintegrations photointerpretations photophosphorylation photoreconnaissances phytophysiologically