| A | B |
| aquamarine | a blue-green color |
| aqueduct | a channel for carrying water from one area to another |
| hydrant | a pipe that stores water that can be used when needed |
| aquarelle | a painting with very light watercolors |
| aqueous | made from water |
| aquatic | growing or living in water |
| Aquarius | a constellation that looks like a man carrying or pouring water |
| hydrophobia | a fear of water |
| hydraulic | a type of system using water to create power |
| hydroponic | a way to grow plants in water instead of dirt |