Habitat- the natural environment of an animal, plant or organism. (Example: Lions live in their habitat, the Savannah.)
Decomposer- An organism that decomposes organic material. (Example: Mushrooms are considered decomposers.)
Niche- Where an organism fits into the ecosystem.
Producers- Organisms that make their own food (Example: Plants make their own food)
Consumers- Organisms that gain energy by feeding on other organisms. (Example: Humans are consumers.)
Hope this helps!!