This is the 3169th most frequent Japanese word.
原作
Original work.
In this sentence, '原作' refers to the original novel that the movie took inspiration from.
この映画は有名な小説を原作としています。
This movie is based on a famous novel.
Here, '原作' denotes the original narrative material which is used for comparison with the adaptation.
原作にはない場面が追加されていました。
There were scenes added that were not in the original work.
In this context, '原作' is used to specify the original work being translated.