HHTS is an acronym for "highly hazardous toxins and substances." It refers to any materials that could cause serious harm to human health or the environment. Some synonyms for HHTS include dangerous substances, hazardous materials, and toxic chemicals. Other terms that may be used to describe these materials include poisonous chemicals, harmful agents, and lethal compounds. It is important for industries and individuals to handle HHTS with care and follow proper safety protocols to prevent accidents and minimize harm. Additionally, regulations are in place to govern the handling and disposal of HHTS to protect both human health and the environment.