instead of fewer mistakes ,there were more in his writing.mo

instead of fewer mistakes ,there were more in his writing.more是代词,还是形容词比较级

我们可以把句子倒回来看
there were more in his writing,instead of fewer mistakes.
我们可以翻译为,他的作文里错误更多了,而不是少了.
more 和fewer在这里作为一个形容词的比较级,我们设想一下,如果是代词,那么指代什么呢,“错误”但是错误已经出现在句子里面了啊.所以毫无疑问是形容词的比较级形式