possibility vs. possibleness

principle vs. rationale

principle vs. rule

precept vs. principle

prediction vs. prevision

prediction vs. prognostication

prescience vs. prevision

prognostication vs. prophecy

prophecy vs. vaticination

prejudgement vs. prejudgment

precondition vs. stipulation

persuasion vs. view

persuasion vs. suasion

pacificism vs. pacifism

pacifism vs. passivism

preconception vs. prepossession

pith vs. substance

psychiatry vs. psychopathology

palaeontology vs. paleontology

palaeoanthropology vs. paleoanthropology

palaeobotany vs. paleobotany

palaeodendrology vs. paleodendrology

paediatrics vs. pediatrics

pediatrics vs. pedology

periodontia vs. periodontics

prosthodontia vs. prosthodontics

palaeozoology vs. paleozoology

palaeornithology vs. paleornithology

palaeobiology vs. paleobiology

palaeogeology vs. paleogeology

palaeoecology vs. paleoecology

psychometrics vs. psychometry

psychometrika vs. psychometry

palaeoclimatology vs. paleoclimatology

palaeogeography vs. paleogeography

palaeopathology vs. paleopathology

palaetiology vs. paletiology

phonemics vs. phonology

palaeology vs. paleology

protoanthropology vs. protohistory

protoarchaeology vs. protoarcheology

palaeoethnography vs. paleoethnography

predilection vs. taste

penology vs. poenology

patristics vs. patrology

precept vs. teaching

partiality vs. partisanship

prejudice vs. prepossess

provincialism vs. sectionalism

page vs. varlet

predicate vs. subject

predicate vs. proclaim

postfix vs. suffix

particle vs. speck

paraphrase vs. paraphrasis

paraphrase vs. rephrase

paraphrase vs. reword

pamphlet vs. tract

preface vs. premise

precede vs. preface

postscript vs. supplement

PS vs. postscript

profile vs. visibility

petition vs. request

postulation vs. request

postulation vs. predication

placeholder vs. proxy

procurator vs. proxy

palaver vs. rhetoric

poppycock vs. stuff

perusal vs. perusing

perusal vs. studying

prescript vs. rule

paean vs. pean

preaching vs. sermon

posit vs. postulate

posit vs. state

premise vs. premiss

pun vs. punning

pun vs. wordplay

paronomasia vs. pun

peace vs. repose

poser vs. sticker

poser vs. poseur

precursor vs. predecessor

postage vs. stamp

phylactery vs. tefillin

period vs. stop

preview vs. trailer

prevue vs. trailer

polytonalism vs. polytonality

prompting vs. suggestion

patter vs. spiel

patter vs. spit

plainchant vs. plainsong

prothalamion vs. prothalamium

paraleipsis vs. paralepsis

paralepsis vs. paralipsis

paralepsis vs. preterition

poetry vs. verse

poesy vs. verse

phonation vs. voice

prolixity vs. prolixness

prolixity vs. windiness

prolixity vs. wordiness

prate vs. prattle

proverb vs. saw

patois vs. vernacular

proffer vs. suggestion

premonition vs. presentiment

particularisation vs. particularization

paster vs. sticker

pip vs. spot

pip vs. whip

pip vs. shoot

prodding vs. urging

pledge vs. toast

pledge vs. plight

pledge vs. subscribe

plight vs. troth

plight vs. quandary

psychokinesis vs. telekinesis

payoff vs. reward

payoff vs. return

preindication vs. sign

paradiddle vs. roll

peal vs. roll

peal vs. ring

pealing vs. roll

purr vs. whir

pulsate vs. pulse

pulse vs. throb

plash vs. splash

plash vs. spatter

plash vs. pleach

pollenation vs. pollination

prurience vs. pruriency

panic vs. terror

panic vs. scare

pang vs. stab

pang vs. sting

peacefulness vs. repose

peaceableness vs. peacefulness

penchant vs. taste

provisions vs. victuals

provender vs. victuals

pud vs. pudding

potage vs. pottage

penoche vs. penuche

panoche vs. penuche

panocha vs. penuche

poilu vs. purloo

pirogi vs. piroshki

pirogi vs. pirozhki

preserve vs. save

preserve vs. uphold

puree vs. strain

pemican vs. pemmican

porc vs. pork

potato vs. spud

pieplant vs. rhubarb

peel vs. skin

peel vs. strip

pepper vs. peppercorn

pimento vs. pimiento

pomelo vs. shaddock

pomelo vs. pummelo

papaw vs. pawpaw

papaya vs. pawpaw

papaia vs. pawpaw

pulasan vs. pulassan

pasture vs. pastureland

pigswill vs. slops

pigwash vs. slops

paste vs. spread

paring vs. shaving

pilaf vs. pilaff

pilaf vs. pilau

pilaf vs. pilaw

philter vs. philtre

Pilsener vs. Pilsner

pair vs. span

patriarchate vs. patriarchy

papacy vs. pontificate

payroll vs. paysheet

parentage vs. parenthood

pesantran vs. pesantren

panchayat vs. panchayet

panchayat vs. punchayet

praesidium vs. presidium

princedom vs. principality

province vs. state

province vs. responsibility

perilune vs. periselene

plowland vs. tillage

ploughland vs. tillage

planet vs. satellite

peneplain vs. peneplane