What part of speech is “responsibility”

a responsibility is a noun that means a duty, task, or obligation that one has to fulfill for themselves, someone else, or a group. Responsibilities can range from everyday tasks to legal or ethical obligations. Grammatically, a responsibility is usually preceded by the determiner 'a,' and it can also be followed by phrases like 'of,' 'for,' and 'toward.'

1. Completing her school assignments is part of her responsibility.

2. Many employees shoulder the responsibility of providing for their families.

3. He has always taken responsibility for his mistakes.

the responsibility of a particular person or group is often referred to in the phrase 'responsibility to,' as in 'responsibility to their families.'