The word "Tokusatsu" was coined at Toho during the 1950s, which was contraction of "Tokugi Satsuei" or "Special Photography." Because of Toho's pioneer filmmaker, Eiji Tsuburaya, a whole industry was born -- "Tokusatsu" or "Special Visual Effects Photography."
Recently, "Tokusatsu" has come to represent all things live-action, containing heavy special visual effects techniques, so there are some sub-categories, such as "Tokusatsu Heroes." When one is referring to Toei's hero shows, they are usually designated "Toei Tokusatsu Heroes," Toho's monster movies are usually referred to as "Toho Kaiju Eiga" (Toho Monster Movies), but the blanket is "Toho Tokusatsu Eiga" (Toho Special Visual Effects Films). But, when used as a genre term, it still includes movies with miniature work and other visual effects that do not feature monsters or superheroes, which covers everything from Disaster Films to War Movies and so on.