I want to say
Today I discovered that 得 has a related term 不得不 which is used to emphasize somebody had to do something they didn't want to.
In fact I'm not even sure what to call that relationship in English。
You can use something like:
相关词
I think 相关词 is too vague in this context
Grammatically, I would say "double negative"
Another similar term is
能 vs 不能不