predominance vs. predomination
permutability vs. permutableness
permutability vs. transposability
progressiveness vs. progressivity
precariousness vs. uncertainness
preciousness vs. pricelessness
pretension vs. pretentiousness
plausibility vs. plausibleness
perishability vs. perishableness
palatability vs. palatableness
perceptiveness vs. perceptivity
profaneness vs. unsanctification
pusillanimity vs. pusillanimousness
pennilessness vs. penuriousness
perspicaciousness vs. perspicacity
predisposition vs. sensitivity
permeability vs. permeableness
penetrability vs. perviousness
posteriority vs. subsequentness
practicability vs. practicableness
profitability vs. profitableness
productiveness vs. productivity
paleencephalon vs. paleoencephalon
palaeencephalon vs. paleencephalon