14 letters
- phenylephrines29
- phenylthiourea26
- philadelphuses28
- philanthropies26
- philanthropist26
- philanthropoid27
- philatelically28
- philhellenisms28
- philhellenists25
- philologically30
- philosophising28
- philosophizers34
- philosophizing37
- phlebographies30
- phlegmatically32
- phonologically30
- phosphokinases29
- phospholipases28
- phosphoprotein28
- phosphorescent28
- phosphorescing30
- phosphorolyses27
- phosphorolysis27
- phosphorolytic30
- phosphorylases27
- phosphorylated28
- phosphorylates27
- photoautotroph25
- photobiologies25
- photobiologist25
- photochemistry29
- photochromisms30
- photocomposers28
- photocomposing31
- photodetectors23
- photoduplicate28
- photoelectrons24
- photoemissions23
- photoengravers26
- photoengraving29
- photofinishers25
- photofinishing28
- photogenically29
- photogeologies24
- photogeologist24
- photogrammetry29
- photoinduction26
- photoinductive29
- photolytically29
- photooxidation28
- photooxidative31
- photooxidizing39
- photoperiodism26
- photoreactions23
- photoreception26
- photoreceptive29
- photoreceptors25
- photoreduction25
- photosensitive24
- photosensitize29
- photosynthates24
- photosyntheses24
- photosynthesis24
- photosynthetic27
- phraseological26
- phraseologists22
- phthalocyanine29
- phycoerythrins29
- physicalnesses26
- physiognomical31
- physiographers28
- physiographies28
- physostigmines27
- phytochemistry31
- phytogeography32
- phytopathogens29
- phytopathology31
- phytoplankters30
- phytoplanktons31
- phytosociology29
- plasmaphereses26
- plasmapheresis26
- plethysmograph32
- pneumatophores27
- polarographies25
- polymorphously32
- polyphonically33
- prosencephalic30
- prosencephalon28
- protoporphyrin28
- pseudepigrapha29
- pseudepigraphs29
- pseudepigraphy31
- pseudomorphism30
- pseudomorphous28
- psychophysical35
- pyelonephritic29
- pyelonephritis26
- pyroninophilic30
- pyrophosphates29
- radioautograph23
- radiotelegraph23
- radiotelephone22
- radiotelephony24
- rechoreographs26
- rephotographed27
- reupholstering24
- rhinencephalic30
- rhinencephalon28
- rhombencephala32
- schizophrenias34
- schizophrenics37
- scintigraphies25
- seismographers24
- seismographies24
- shadowgraphies27
- somatotrophins23
- sophisticating25
- sophistication23
- spectrographic30
- spermatophores25
- spermatophytes27
- spermatophytic30
- sporangiophore25
- staphylococcal32
- staphylococcic34
- staphylococcus32
- stereographies21
- stereographing24
- stratigraphies21
- subatmospheric29
- superenciphers27
- superphenomena28
- superphosphate28
- sycophantishly30
- telencephalons26
- telephonically28
- terephthalates22
- theosophically28
- thermographies26
- undecipherable29
- underemphasize34
- unemphatically31
- xenophobically37
- xerophthalmias32
- zoogeographers32
- zoogeographies32