11 letters
- philandered20
- philanderer19
- philatelies18
- philatelist18
- philhellene22
- philistines18
- philodendra20
- philologies20
- philologist20
- philosopher22
- philosophes22
- philosophic25
- phlebitides21
- phlebograms25
- phlogistons20
- phlogopites22
- phoenixlike29
- phonemicist23
- phonetician21
- phoninesses18
- phonogramic25
- phonographs24
- phonography26
- phonologies20
- phonologist20
- phonotactic23
- phosphatase21
- phosphatide22
- phosphatize30
- phosphonium26
- phosphorite21
- phosphorous22
- phosphoryls24
- photocopied23
- photocopier22
- photocopies22
- photodiodes18
- photofloods21
- photographs23
- photography25
- photoionize26
- photolyzing31
- photomapped26
- photometers19
- photometric22
- photomosaic22
- photomurals21
- photoperiod20
- photophases21
- photophobia24
- photophobic27
- photophores21
- photoreduce21
- photoresist16
- photosetter16
- photosphere21
- photostated17
- photostatic19
- photosystem21
- phototactic22
- phototropic22
- phrasemaker23
- phraseology21
- phycocyanin28
- phycologies24
- phycologist24
- phycomycete29
- phylloclade25
- phyllotaxes27
- phyllotaxis27
- phylloxerae27
- phylloxeras27
- phylogenies22
- physiatrist18
- physicalism25
- physicalist22
- physicality24
- physiognomy26
- physiologic24
- phytoalexin27
- phytochrome26
- phytosterol19
- pictographs24
- pictography26
- planisphere21
- planography25
- pleomorphic26
- pneumograph26
- podophyllin25
- podophyllum28
- polygrapher24
- polygraphic27
- polymorphic28
- polyphagias24
- polyphagies24
- polyphagous25
- polyphenols24
- polyphonies23
- polyphonous24
- pornography24
- porphyritic24
- procephalic26
- prophesiers19
- prophesying24
- prophethood22
- prophetical23
- prophylaxes29
- prophylaxis29
- protophloem23
- prototrophs19
- prototrophy21
- pseudomorph24
- psilophytes22
- psilophytic25
- psychograph28
- radiographs19
- radiography21
- radiophones18
- radiophotos17
- reemphasize28
- renographic22
- reprography23
- reupholster18
- rhizosphere27
- saprophytes21
- saprophytic24
- sarcophagus22
- saxophonist24
- scenography24
- scyphistoma24
- scyphozoans31
- seismograph21
- semaphoring22
- serigrapher18
- shadowgraph24
- sheepherder19
- shepherdess19
- shepherding22
- slaphappier23
- sonographer19
- sophistical20
- sophistries16
- sousaphones18
- spermophile23
- sphalerites17
- sphenopsids21
- spherically23
- spherometer19
- spheroplast20
- spherulites18
- spherulitic21
- sphincteric23
- sphingosine20
- sporophores19
- sporophylls23
- sporophytes21
- sporophytic24
- staphylinid21
- stenography21
- stephanotis17
- stereograph18
- stereophony19
- straphanger19
- stylography23
- sulphureous20
- sulphurised20
- sulphurises19
- sycophantic25
- sycophantly25
- symphonious23
- symphonists22
- synaloephas20
- syphilitics22
- taphonomies20
- taphonomist20
- technophile23
- technophobe25
- telegraphed20
- telegrapher19
- telegraphic22
- telephoners18
- telephonies18
- telephoning21
- telephonist18
- thallophyte22
- theophanies19
- theosophies18
- theosophist18
- thermograph23
- thermophile22
- tocopherols20
- tomographic24
- topographer21
- topographic24
- toxophilies24
- toxophilite24
- triphthongs21
- trochophore21
- trophically23
- trophoblast20