| BLASTOPOR | • BLASTOPOR n. the opening of the archenteron in the gastrula that develops into the anus of some animals, also BLASTOPORE. |
| BOLTROPES | • boltropes n. Plural of boltrope. • bolt-ropes n. Plural of bolt-rope. • bolt␣ropes n. Plural of bolt rope. |
| OVERPLOTS | • overplots v. Third-person singular simple present indicative form of overplot. • OVERPLOT v. to devise an overly complex plot for. |
| PISTOLERO | • PISTOLERO n. one who uses a pistol, also PISTOLEER, PISTOLIER. |
| PLIOTRONS | • pliotrons n. Plural of pliotron. • PLIOTRON n. a type of vacuum tube. |
| POLTROONS | • poltroons n. Plural of poltroon. • POLTROON n. a despicable coward, also POULTROONE. |
| POORLIEST | • poorliest adj. Superlative form of poorly: most poorly. • poorliest adv. (Rare, literary, dated) superlative form of poorly: most poorly. • POORLY adj. unwell. |
| PORTHOLES | • portholes n. Plural of porthole. • PORTHOLE n. a small window in a ship's side. |
| PORTOLANS | • portolans n. Plural of portolan. • PORTOLAN n. (Italian) in the Middle Ages, a navigation manual, also PORTOLANO, PORTULAN. |
| POTHOLERS | • potholers n. Plural of potholer. • POTHOLER n. someone who explores limestone potholes. |
| PROLOGIST | • prologist n. (Rare) The writer or speaker of a prologue. • PROLOGIST n. a writer of prologues. |
| PROTOCOLS | • protocols n. Plural of protocol. • PROTOCOL v. to draw up a protocol. |
| PULMOTORS | • pulmotors n. Plural of pulmotor. • PULMOTOR n. a respiratory device. |
| SPOLIATOR | • spoliator n. (Obsolete) One who spoliates. • SPOLIATOR n. one who spoliates. |
| STOLPORTS | • STOLports n. Plural of STOLport. • STOLPORT n. an airport for aircraft needing shorter runways. |
| TROOPIALS | • troopials n. Plural of troopial. • TROOPIAL n. any of various American orioles, also TROUPIAL. |
| UPROOTALS | • uprootals n. Plural of uprootal. • UPROOTAL n. the act of uprooting. |