The word "immortalities" refers to the state or quality of being endless or undying. Some synonyms for this word include "eternality", "perpetuity", "endlessness", "infinity", and "everlastingness". Each of these words conveys the idea of something that is infinite or timeless, and can be used in a variety of contexts when discussing immortality or eternal life. Whether discussing religious beliefs in an afterlife, the prospect of achieving lasting fame or legacy, or the scientific quest for immortality, using these synonyms can add depth and nuance to discussions about the concept of eternal life.