這兩個單詞用來表達強制的意思時，force是動詞，compulsory是形容詞，用法非常不一樣。下面詳細分析一下這兩個詞。

force可以作名詞也可以作動詞，名詞是力量武力的意思，動詞是強迫的意思。例句，But the force that was guiding her wouldn't permit her to act on such a thought.但是那股引導她的力量絕不會允許她這麼做。/They try to force you to do a rational calculation to justify the cost.他們嘗試強迫你做一個理性的估算去為花費找藉口。

compulsory是形容詞，意思為必須做的，比如義務制教育，compulsory education。

force是力量或者逼迫的意思，而compulsory則是強制性的意思，區別可以從以下例子看出：

It is compulsory policy for all of us to accept the vaccine, at least you are forced to take a covid 19 test. 接受疫苗是我們所有人的強制性政策，至少您被迫接受 Covid 19 測試。