13 letters
- photochromism29
- photocomposed28
- photocomposer27
- photocomposes27
- photomontages24
- phycomycetous32
- physiognomies26
- pleomorphisms28
- pneumonectomy30
- poliomyelitis23
- polychotomies27
- polychotomous28
- polychromatic30
- polyribosomal26
- polyribosomes25
- pompousnesses24
- postvasectomy28
- potentiometer20
- precombustion27
- precommitment29
- predominances25
- predominantly25
- predominately24
- predominating24
- predomination22
- prenominating24
- prenomination22
- prolegomenous24
- promiscuities23
- promiscuously27
- promotability25
- promotiveness24
- promulgations24
- prostatectomy24
- pseudomonades23
- pseudomorphic29
- psychometrics29
- psychometries26
- psychosomatic29
- psychrometers26
- psychrometric29
- pyrheliometer24
- pyromorphites26
- quarrelsomely30
- randomization28
- recombination24
- recommendable28
- recommissions23
- recommitments26
- recompilation24
- recomposition23
- recomputation24
- reflectometer23
- reflectometry25
- refractometer22
- refractometry24
- renominations19
- respirometers19
- respirometric22
- rhabdomancers26
- rhabdomancies26
- rhodomontades21
- rhombohedrons25
- romanizations27
- romanticising23
- romanticizing32
- saccharometer24
- saccharomyces29
- sadomasochism25
- sadomasochist22
- schussboomers25
- seismometries19
- semiautomatic23
- sensitometers17
- sensitometric20
- socioeconomic26
- somatological23
- somatopleures21
- somatosensory19
- somatostatins17
- somatotrophin22
- somatotropins20
- somersaulting21
- somnambulated26
- somnambulates25
- somnambulisms28
- somnambulists25
- somnifacients24
- spectinomycin29
- spectrometers22
- spectrometric25
- splenectomies24
- splenectomize33
- stereoisomers16
- stichomythias25
- stichomythies25
- stoichiometry23
- streptomycete24
- streptomycins25
- stromatolites17
- stromatolitic20
- subcommission27
- subcommittees26
- subcomponents28
- supercomputer27
- superdiplomat25
- superromantic24
- superstardoms21
- sympathectomy31
- synchromeshes26
- syringomyelia24
- syringomyelic27
- taxonomically31
- telecommuters24
- telecommuting27
- tellurometers19
- tenderometers18
- tensiometries17
- theriomorphic26
- thermometries21
- thoracotomies21
- thrombokinase26
- thymectomized36
- thymectomizes35
- thyroidectomy26
- tomboyishness24
- tonsillectomy24
- toothsomeness19
- tracheotomies21
- tragicomedies22
- trichromatism24
- trigonometric22
- troublesomely24
- ultraromantic22
- unaccompanied29
- uncomfortable28
- uncomfortably30
- uncompensated26
- uncompetitive28
- uncomplaining29
- uncomplicated29
- uncustomarily25
- unforthcoming29
- unhomogenized33
- unpromisingly27
- unsymptomatic29
- unwholesomely27
- vasectomizing35
- venturesomely25
- wafflestomper29
- wearisomeness20
- welcomenesses24
- wholesomeness23
- winsomenesses21
- womanlinesses22
- worrisomeness20
- zombification35