Voidnesses is a term that refers to the state or quality of being empty or without substance. There are several synonyms that can be used in place of this word to convey the same meaning. One such synonym is hollowness, which denotes a lack of fullness or depth. Similarly, barrenness is another synonym that suggests a state of emptiness or desolation. Vacancy, on the other hand, refers to a state of being unoccupied or free from activity. Other synonyms that can be used for voidnesses include emptiness, nothingness, and nullity. All of these words can be used interchangeably to describe the absence of something or the absence of substance in something.