| A | B | 
|---|
| astrology | study of stars | 
| astronomy | systemized knowledge of stars | 
| benephile | good person | 
| hydrant | large outlet for water | 
| megaphone | instrument used to increase loudness of voice | 
| micrometer | measure very small things | 
| pathology | study of diseases | 
| pseudonym | false name | 
| telephone | far reaching sound | 
| autonomy | rule of oneself, self-knowledge | 
| hydrometer | device for measuring water | 
| photograph | written light, production of an image by the action of light | 
| microbiology | study/science of small living things | 
| microscope | a device for seeing small things | 
| pseudopod | a creature with a false foot | 
| hydroplane | a water plane | 
| agronomy | the science/knowledge of agriculture | 
| benefactor | one who does good deeds | 
| megalith | a large stone | 
| astronautics | the practice of being among stars | 
| pathos | same feelings | 
| photocopy | a copy made by the use of light | 
| phonetic | concerning sound | 
| sympathy | sharing someone else's suffering | 
| metronome | a clock that "rules the measure" | 
| photosynthesis | plants use the energy of light to synthesize carbohydrates from carbon dioxide and water | 
| polyphonic | music that has many voices or sounds | 
| megalopolis | greatest concentration of population identified by large city | 
| microcosm | small universe | 
| hydroponics | the science of growing plants in water | 
| benefit | an advantage; to be helpful | 
| astrophysics | science that studies the physical and chemical nature of stars |