11 letters
- opprobrious21
- opprobriums24
- opsonifying23
- optionality18
- optokinetic22
- optometries17
- optometrist17
- ornithopods18
- ornithopter17
- orthopaedic20
- orthopedics20
- orthopedist17
- orthopteran17
- orthoscopic22
- osteopathic19
- osteoplasty17
- outcropping24
- outdropping22
- outpopulate20
- outscooping21
- overcropped25
- overdevelop24
- overoperate18
- overpeopled23
- overpeoples22
- overtopping24
- pantropical22
- paradropped22
- paratrooper17
- pedophiliac24
- pedophilias21
- peoplehoods21
- phenocopies23
- philosopher22
- philosophes22
- philosophic25
- phlogopites22
- photocopied23
- photocopier22
- photocopies22
- photoperiod20
- photophases21
- photophobia24
- photophobic27
- photophores21
- phototropic22
- plecopteran22
- pleiotropic21
- podophyllin25
- podophyllum28
- polariscope21
- popularised20
- popularises19
- popularized29
- popularizer28
- popularizes28
- populations20
- preadopting21
- presbyopias22
- presbyopics25
- propagandas21
- propagating22
- propagation20
- propagative23
- propagators19
- propellants20
- propellents20
- prophesiers19
- prophesying24
- prophethood22
- prophetical23
- prophylaxes29
- prophylaxis29
- propinquity30
- propionates18
- propitiated18
- propitiates17
- propitiator17
- proplastids19
- proportions18
- proposition18
- propounders20
- propounding23
- propraetors17
- propranolol20
- proprietary19
- proprieties17
- proprietors17
- propulsions20
- prosauropod19
- protopathic22
- protophloem23
- protoplanet19
- protoplasms21
- protoplasts18
- prototrophs19
- prototrophy21
- pseudopodal21
- pseudopodia20
- psilophytes22
- psilophytic25
- psychopaths26
- psychopathy28
- radarscopes18
- radiophones18
- radiophotos17
- redeveloped21
- redeveloper20
- reoperating17
- reoperation15
- repopulated20
- repopulates19
- retinopathy19
- retinoscopy20
- rhinoplasty20
- rhizoplanes27
- rockhoppers26
- ropedancers19
- ropedancing22
- ropewalkers22
- salespeople19
- saprophytes21
- saprophytic24
- sarcophagus22
- sarcoplasms21
- saxophonist24
- scallopinis20
- scaloppines22
- scolopendra20
- scopolamine22
- semipopular22
- semitropics20
- shopkeepers23
- shoplifters20
- shoplifting23
- shopwindows24
- showstopper22
- sniperscope21
- sociopathic22
- sopaipillas19
- sophistical20
- sophistries16
- soppinesses18
- spanakopita22
- spanokopita22
- spermophile23
- sphenopsids21
- spheroplast20
- sporophores19
- sporophylls23
- sporophytes21
- sporophytic24
- statoscopes17
- steatopygia18
- steatopygic21
- stereophony19
- stereoscope17
- stereoscopy19
- stethoscope19
- stomatopods18
- stopwatches22
- stroboscope20
- stylopodium22
- suboptimize30
- subtropical22
- sycophantic25
- sycophantly25
- syncopating23
- syncopation21
- syncopative24
- syncopators20
- synopsizing29
- technophile23
- technophobe25
- teenybopper23
- telescoping21
- thallophyte22
- theophanies19
- theosophies18
- theosophist18
- thermophile22
- thermopiles20
- thermoscope22
- thiopentals18
- thixotropic26
- thyrotropic21
- thyrotropin19
- tocopherols20
- topdressing18
- topgallants19
- toplessness16
- toploftical22
- toploftiest18
- topnotchers20
- topocentric21
- topographer21
- topographic24
- topological21
- topologists17
- toponymical24