Piacular offerings are religious offerings that are made to atone for sins and wrongdoings. If you're looking for synonyms, there are several words that can be used in place of piacular offerings. Some popular alternatives include expiatory offerings, propitiatory offerings, sacrifice, atonement, and redemption. The word "expiatory" refers to something that is done as a means of atonement, so expiatory offerings can be used interchangeably with piacular offerings. Propitiatory offerings are similar in that they are made as a means of appeasing a deity or gaining favor. Ultimately, all of these words capture the concept of making a sacrifice or offering to make amends or seek forgiveness for offenses.