Fertilizer compound is a term used to describe a combination of elements that are used to improve the quality of soil. NITRATE (7 letters), Urea (4 letters), POTASH (6 letters) and Niter (5 letters) are all components of fertilizer compounds. NITRATE is a salt of nitric acid, Urea is an organic compound, POTASH is a potassium-rich mineral, and Niter is a type of salt. Together, these elements are used to increase the fertility of soil and promote plant growth.