區別就是兩者詞性是不一樣，具體的不同如下
over表結束了是形容詞
finish是動詞，但be over=finish，中文意思是結束，完成了。
例如
Our budding romance was over.我們剛剛萌發的浪漫愛情結束了。
=Our budding romance finished
我們到達時，會議已經結束了。By the time we arrived the meeting was over.
怎麼區別over和finish
over 與finish（結束……）
over作此意講一般是副詞，前面必須有動詞才能做謂語，一般結構是be over. 例如：School is over， I went straight home.
而finish是動詞，後面接名詞或動詞的ing形式。例如：
I finished my homework， I went to bed.
或I finished doing my homework， I went to bed.
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