The word "souths" is already a plural noun, referring to multiple locations or regions to the south of a certain point. However, if one wanted to use a different word to describe this concept, there are several options. "Southern regions" or "southern locales" could work. Alternatively, one could use specific words for the regions in question, such as "down south," "the southern states," or "the tropics." Other synonyms for "south" that could be used in a different context include "southeast," "southwest," "due south," "southerly," or "below the equator".