Maintainability refers to the ability of a system, product or service to be maintained or serviced with ease. There are several synonyms that can be used to describe maintainability, including manageability, durability, reliability, resilience, and sustainability. The word manageability refers to the ability of a system to be controlled and supervised effectively. On the other hand, the term durability relates to the ability of a product or service to last a long time without breaking down. Reliability describes the consistency of a system to perform as expected without failures. Resilience relates to the ability of a system to adapt to changes and challenges without breaking down. Lastly, sustainability refers to the ability of a system to continue functioning without causing any harm to the environment.