Compost
Part of speech: noun
Definition: The decayed remains of organic matter that has rotted into a natural fertilizer
Part of speech: verb
Definition: To produce compost, let organic matter decay into fertilzer
Humus
Part of speech: noun
Definition: A large group of natural organic compounds, found in the soil, formed from the chemical and biological decomposition of plant and animal residues and from the synthetic activity of microorganismsAn alternative spelling of hummus.