1、读音不同
full ：[fʊl]
fool: [fu:l]
2、用法不同
Full:可作形容词、副词、名词、动词
Fool：可作形容词、名词、动词
3、意思不同
Full:
(1) 满的；充满的
My suitcase was full of books.
我的提箱装满了书。
（2）大量的;许多的
The sky was full of brightly coloured fireworks.
满天一片色彩绚丽的烟火。
（3）想得很多，谈得很多
He was full of his new job
他滔滔不绝地谈他的新工作
（4）吃饱了的
The kids still weren't full, so I gave them an ice cream each.
孩子们还没有吃饱，所以我给他们每人一份冰激凌。
（5）圆的；满的
appearing as a complete circle
The moon was full, the sky clear.
圆月碧空。
Fool:
（1）蠢人；傻瓜
I felt a fool when I realized my mistake.
我意识到了自己的错误，觉得自己是个傻瓜
(2)欺骗；愚弄
You don't fool me!
不要骗我！
(3) 傻的；愚蠢的
That was a damn fool thing to do!
干那种事真蠢！
