Doth best means to do something in the most excellent or effective way. There are several synonyms that can be used to convey the same meaning. The word 'excel' means to do something exceptionally well, surpassing the expected standards. 'Outdo' means to do something better than others or to exceed the limit of performance. 'Outclass' is another synonym that implies doing something in a superior or better way than others. 'Surpass' means to do something exceeding the limits of excellence. 'Outshine' suggests doing something in a way that makes one stand out or appear better than others. All these synonyms can be used to express the idea of doing something in the best possible way.