Worm killers are substances designed to eliminate worms and other parasites inside the body of humans and animals. Common synonyms of the term "worm killer" are "antiparasitic", "anthelmintic", "vermicidal", "vermifuge", and "helminthic". Antiparasitics work by killing or disabling parasites, while anthelmintics target specifically worms. Vermicidals and vermifuges both refer to substances that kill worms, but vermifuges also help expel them from the body. On the other hand, helminthics are medications that prevent or treat helminthic infections caused by various types of parasites. Regardless of the term used, worm killers play a crucial role in ensuring good health and wellbeing.