replaceability (noun)

1. In a romantic relationship, emotional replaceability can be devastating for the person who feels easily replaceable.

2. As a joke, one might say that the only replaceability between twins is their identical appearance.

3. Within the anime storyline, the main character's unique abilities prevent his replaceability within the group.

4. According to some religious teachings, the idea of replaceability implies that each individual has a unique purpose in the universe.