Select the most appropriate word for the group of words.

One who makes an active effort to promote human welfare

Philanthropist

The meaning of the all the option words are- 

1. Philanthropist : A "philanthropist" is an individual who is actively involved in the promotion of the welfare of others, typically by donating money, time, or resources to charitable causes.

2.  Misogynist: A "misogynist" is a person who holds strong prejudices or dislikes towards women, often displaying a deep-seated hatred or hostility towards them.

3. Sexist: "Sexist" refers to someone who discriminates against individuals or treats them unfairly based on their sex or gender.

4. Feminist: A "feminist" is a person who advocates for and supports the social, political, and economic equality of the sexes.

- Thus, the word that suitably substitutes the group of words in the question is philanthropist.