基本上无大区别.但是在正式英语如填表格,只能用ancestor.forefather通常用于描述某某团体的创始人.ancestor n.A person from whom one is descended, especially if more remote than a grandparent; a forebear.祖先,祖宗繁。
forefather [英][ˈfɔ:fɑ:ðə(r)][美][ˈfɔ:rfɑ:ðə(r)]n.祖先,祖宗;复数:forefathers 双语例句 1 Your God is one and your forefather is one.你的真主。

谢谢了哦!1. 表示"早先","预先","之前","前部"forefather祖先,祖宗
老祖宗 [词典] ancestor; forefather; old ancestress; progenitor;[例句]接着老祖宗丈摸了摸我的嘴。
Next, our ancestor touched my mouth.

通过这种方法背单词,事半功倍且遗忘率较低。
fore-表示"前面,预先"forestall 阻止。
forebode 预兆;凶兆。
forefather 前人,祖先。
forearm 前人,祖先。
forecast 预料。
foreshadow 预示,暗示。