Another name for head lice is —

The term "Pediculosis" specifically refers to an infestation of lice, which includes head lice. It derives from "Pediculus," the Latin word for louse. Head lice, scientifically known as "Pediculus humanus capitis," are parasites that live on the scalp and feed on human blood. The use of "Pediculosis" in this context indicates a direct association with lice infestations, making it the correct choice for another name for head lice.

In contrast, "Scabies" refers to an infestation caused by a different parasite, the mite Sarcoptes scabiei, which leads to intense itching and a rash but is not related to lice. "Helminths" is a category that includes parasitic worms, which are entirely different from lice or any type of ectoparasite. Lastly, "Crabs" is a colloquial term used for pubic lice, another type of lice but not specifically head lice, thus not a suitable synonym in this context.