education是词根还是词干

education是词根，它的派生词是educational ，educational中文意思是adj. 教育的有教育意义的

I think we need to improve our educational system in general.我认为我们需要从总体上改进我们的教育体制。

Educational practice is liable to sudden swings and changes.

Education，这个单是三个词根的拼写，前面那个“E”是向外的意思，“duce”是引导，“tion”是名词，引导出来，所以education当然是词根。