There are several synonyms that can be used in place of the word "grails." Some of these include treasures, gems, prizes, rarities, and coveted possessions. Each of these words capture the sense of something valuable, desirable, and sought after. Treasures and gems typically refer to objects of high monetary or sentimental value, while prizes and rarities often suggest something that is difficult to obtain or find. Coveted possessions, on the other hand, can refer to anything from an object to a skillset or position. All of these synonyms provide alternative ways to describe something that is highly valued, prized, or important.