14 letters
- polypropylenes30
- popularization32
- populousnesses24
- postcopulatory27
- postmenopausal26
- predevelopment30
- preoperational22
- preoperatively27
- propagandistic27
- propagandizers33
- propagandizing36
- propitiousness22
- proportionable25
- proportionably27
- proportionally25
- proportionated22
- proportionates21
- propositioning24
- proprietorship25
- proprietresses20
- proprioception27
- proprioceptive30
- proprioceptors26
- protoplanetary24
- protoporphyrin28
- pseudopregnant26
- psychophysical35
- pyroninophilic30
- pyrophosphates29
- reappropriated24
- reappropriates23
- redevelopments27
- repopularizing34
- schizophrenias34
- schizophrenics37
- scleroproteins22
- seropositivity23
- sociopolitical25
- somatotrophins23
- sophisticating25
- sophistication23
- spectroscopies26
- spectroscopist26
- spermatophores25
- spermatophytes27
- spermatophytic30
- spinthariscope26
- sporangiophore25
- sporopollenins24
- subdevelopment31
- submicroscopic33
- subpopulations27
- sycophantishly30
- tachistoscopes25
- tachistoscopic28
- telescopically28
- theosophically28
- thermoplastics26
- thermotropisms25
- thigmotropisms27
- thromboplastic29
- thromboplastin27
- toploftinesses22
- tropocollagens25
- tropologically27
- unappropriated26
- underdeveloped27
- underpopulated26
- unpopularities24
- xenophobically37
- xerophthalmias32