Chlorophyllous is an adjective used to describe organisms that contain chlorophyll, a green pigment found in most plants and algae that helps with photosynthesis. Some synonyms for chlorophyllous include green, verdant, leafy, foliated, and photosynthetic. These words all refer to the same concept of plants or organisms that are able to harness sunlight for energy. Other related words include chloroplast, the organelle in plant cells that contains chlorophyll, and photosynthesis, the process by which organisms convert sunlight into energy. Overall, there are many different words that can be used to describe chlorophyll and its importance in the natural world.