Insertions refer to the act of adding or putting something into a specified space or object. There are various synonyms for insertions that one can use such as installation, insertion, embedment, implantation, interjection, infusion, intercalation, and introduction. Installation is commonly used in the technology world when talking about software. Embedment and implantation refer to the act of physically inserting something into a surface or organism. Infusion and intercalation refer to the gradual addition of something into something else. Interjection and introduction are used when talking about verbal insertions in conversations or speeches. Overall, the synonym for insertions you choose will depend on the context of the sentence.