Fertilizer materials are substances used to supplement soil in order to promote plant growth. Common fertilizer materials include PEAT (4 letters), bonemeal (8 letters), and MANURE (6 letters). PEAT is a type of soil composed of partially decayed organic matter, such as mosses and other plants. Bonemeal is a type of fertilizer made from ground animal bones, which is rich in phosphorus and calcium. MANURE is a type of fertilizer made from the waste of animals, which is rich in nitrogen and other nutrients.