Inoculant refers to a substance that is added to a material to enhance its biological activity. Some synonyms of the term include biofertilizer, microbial fertilizer, and growth enhancer. Biofertilizer specifically refers to a type of inoculant that contains a high concentration of microbes that help break down organic matter, improve soil quality, and increase plant growth. Microbial fertilizer is a more general term that encompasses any substance that contains beneficial microorganisms. Similarly, growth enhancer can refer to any substance that improves plant growth, including chemical fertilizers. Overall, inoculants play an important role in sustainable agriculture and are a useful tool for farmers and gardeners alike.