如何打破读取此文本文件（使用ifstream）？ C ++

I wanna stop the reading of my text input file when the word "synonyms" appears. I'm using ifstream and I don't know how to break the loop. I tried using a stringstream "synonyms" but it ended up junking my bst. I included the complete project files below in case you wanna avoid typing. I wanna stop the reading of my text input file