EXPLORATORIUM
| P | ||||||
| parallel | parasite | particle | penicillin | periodic table | peristalsis | Phloem |
| photosynthesis | pitch | placenta | planet | plasma | pollen | pollution |
| polymer | positive | potential | precipitate | predator | prediction | pressure |
| prey | prism | product | propagation | proportional | protein | proton |
| pyramid | ||||||
| R | ||||||
| radiation | radioactive | reaction | reactivity | reduction | reflection | refraction |
| renewable | reproduction | repulsion | resistance | resistor | resonance | respiration |
| result | retina | reversible | ||||
| S | ||||||
| saliva | salt | satellite | saturated | sedimentary | sensitivity | series |
| skeleton | sodium | solar system | solenoid | solid | solubility | solute |
| solution | solvent | species | spectrum | sperm | stimulus | stomata |
| stratosphere | sublimation | sulphate | suspension | symbiosis | symbol | synapse |
| synthesis | ||||||