look over（察看, 检查） vs overlook （漏看，忽略） (来源：老牌的英语学习网站 http://www.EnglishCN.com)
Look over is a phrasal verb.
When you look over something or someone you quickly examine it or them.
I asked my teacher to look over what I had written.
Overlook is a verb.
When you overlook someone or something you fail to notice or consider it or them.:
I think my teacher overlooked some of my mistakes.
!Look over is two separate words, overlook is one word.