| Proto finish? | 13 |
| Proto suffix | 12 |
| Proto- finish | 13 |
| Proto-baby | 10 |
| Proto-helicopter designer | 25 |
| Proto-matter from which the universe was made | 45 |
| Proto-seed | 10 |
| Proto-___-European (early language) | 35 |
| Protocol | 8 |
| Protocols | 9 |
| Protomatter of the universe | 27 |
| Proton carriers | 15 |
| Proton counts: Abbr. | 20 |
| Proton donor | 12 |
| Proton feature? Favorable use of plastic? Whatever! I'm a PC | 64 |
| Proton or electron | 18 |
| Proton or electron, take your pick | 34 |
| Proton part | 11 |
| Proton sites | 12 |
| Proton spot | 11 |
| Proton's place | 18 |
| Proton's spot | 17 |
| Proton-enhanced cure-all? | 25 |
| Proton-enhanced form of reproduction? | 37 |
| Proton-enhanced instrument of torture? | 38 |
| Proton-enhanced opportunist? | 28 |
| Protons' places | 19 |
| Protoplasmic mass that's neither fungus nor animal | 54 |
| Protoplasmic units | 18 |
| Prototype | 9 |
| Prototype (abbr.) | 17 |
| Prototype circuit device | 24 |
| Prototype detail, briefly | 25 |
| Prototype flying auto of 1949 | 29 |
| Prototype shows | 15 |
| Prototype vehicle | 17 |
| Prototype version | 17 |
| Prototype, for short | 20 |
| Prototypical address | 20 |
| Prototypical film | 17 |
| Prototypical frenemy? | 21 |
| Prototypical laundry challenges | 31 |
| Prototypical pooch | 18 |
| Prototypical small town | 23 |
| Prototypical victim | 19 |
| Protozoa | 8 |
| Protozoa genus | 14 |
| Protozoa propellers, perhaps | 28 |
| Protozoa with pseudopodia | 25 |
| Protozoa with pseudopodia (var.) | 32 |
| Protozoa: Var. | 14 |
| Protozoan | 9 |
| Protozoan propellers | 20 |
| Protozoan pushers | 17 |
| Protozoan studied in biology class | 34 |
| Protozoan that can photosynthesize | 34 |
| Protozoan, e.g. | 15 |
| Protozoan: Var. | 15 |
| Protozoans | 10 |
| Protract | 8 |
| Protract, with "out" | 30 |
| Protracted | 10 |
| Protracted absences | 19 |
| Protracted argument | 19 |
| Protracted assault | 18 |
| Protracted attack | 17 |
| Protracted battle | 17 |
| Protracted battles | 18 |
| Protracted period | 17 |
| Protracted poems | 16 |
| Protracted prayer | 17 |
| Protracted sound from the undecided | 35 |
| Protractedly | 12 |
| Protractor measure | 18 |
| Protractor measurement | 22 |
| Protractor measurements | 23 |
| Protractor units | 16 |
| Protractor's measure | 24 |
| Protracts, with "out" | 31 |
| Protrude | 8 |
| Protrude outward | 16 |
| Protrude, as the chin | 21 |
| Protrude, with "out" | 30 |
| Protruded | 9 |
| Protruded-lip expression | 24 |
| Protrudes | 9 |
| Protrudes, in a way | 19 |
| Protrudes, with "out" | 31 |
| Protruding bellybutton | 22 |
| Protruding knot on a tree | 25 |
| Protruding navel | 16 |
| Protruding part | 15 |
| Protruding protector | 20 |
| Protruding rock | 15 |
| Protruding tooth | 16 |
| Protruding tree knots | 21 |
| Protruding window | 17 |
| Protruding, as from water | 25 |
| Protrusion | 10 |
| Protrusion on a door or drawer | 30 |