"Farther than" is a phrase that often means distance, but it can also indicate an increase in a non-physical sense as well. When expressing distance, synonyms such as "beyond" or "distant from" can be used interchangeably. On the other hand, if the phrase is used in a non-physical sense, it could be replaced by expressions such as "more than", "greater than", or "bigger than". Another way to express the idea of surpassing or exceeding something might be to use "outdistancing," "overtaking," or "surpassing." In all cases, it is essential to keep the context and intended meaning of the phrase in mind when swapping out synonyms.