obligator
🇺🇸
/'ɒblɪɡɑtəʊə/
🇬🇧
/'ɒblɪɡɑ:təʊə/
A person or thing that has to do something because of a rule or law.
The obligator must submit the report by the end of the month.
In nature, an organism that can only live or survive in a certain way or environment.
Bees are considered obligators in the pollination process.