Aching void simply refers to a feeling of emptiness or hollowness that one experiences due to a variety of reasons. The term can be replaced with other synonyms that can be used interchangeably depending on the context. Empty space, hollow, vacuum, blankness, and emptiness are some of the common synonyms for aching void. Other synonyms include a sense of loss, a feeling of pain, and a yearning for something that is missing. Regardless of the synonym used, aching void always connotes a feeling of desolation and incompleteness that needs to be filled.