Retentions refer to the keeping or holding something back. There are several synonyms for this word that can be used interchangeably in different contexts. The most common synonyms include preservation, conservation, and retention. Other synonyms you can consider are maintenance, sustentation, and upholding. Retention can also be referred to as reservation, conservation, or preservation in some cases. In the business world, retention is referred to as keeping customers or a workforce, and synonyms for this context can include engagement, loyalty, and satisfaction. In conclusion, synonyms for retention vary in different contexts, and it is important to use the appropriate term to convey the correct message.