Organic fertilizer is a type of fertilizer made from natural sources such as animal manure, plant waste, and compost. There are many different synonyms that can be used to describe this type of fertilizer. Some common alternatives include natural fertilizer, green fertilizer, eco-friendly fertilizer, sustainable fertilizer, and biological fertilizer. These terms all refer to fertilizers that are made from natural sources and are free from synthetic chemicals. Other synonyms for organic fertilizer include compost, humus, and worm castings. These terms are often used interchangeably with organic fertilizer to describe the same type of natural and sustainable soil enrichment.