Is any person who promotes a change in society

This could be many things depending on the context.

Explanation:

Humanitarian: A person who promoted social welfare and social reforms.

Advocate: A person who speaks or writes in support of a cause, person, etc.

hope this helps!! if not, please give us more context.

Explanation:

feminist: someone to advocates for women's rights.

activist: someone with a certain cause they fight for. they host protests, speak at events, and raise money and awareness on behalf of their cause.  

uncanny would be like unlucky or disaster. you can look for more in the dictionary or if you have text book then turn to a. 17 but it's different with textbooks.