There are several synonyms for the word "stenchier," which means having a stronger or more unpleasant odor. These include fouler, more pungent, more offensive, more odorous, more noxious, more rank, more fetid, more putrid, and more rancid. All of these words describe a smell that is particularly strong, unpleasant, and often overwhelming. Whether used to describe a garbage heap or a rotting animal carcass, these synonyms convey a sense of disgust and discomfort. It's important to note that the intensity of a scent can be subjective, so what one person finds stenchier may not be as offensive to another.