do you say women's role or women's roles in society

It depends upon what you mean. Do you mean that women have only one role in society?

Like if you are saying women's roles society have drastically changed

Yes, I think that is best.

When referring to the roles of women in society, it is commonly accepted to use the plural form "women's roles" rather than the singular form "women's role." This is because women in society have various roles and functions that cannot be generalized into a single role. Additionally, using the plural form reflects the diversity and multiplicity of women's contributions and experiences in different areas of society.

To find this information, you could search for articles, books, or scholarly papers that discuss the roles of women in society. You might search through online databases, libraries, or academic websites. Reading on these sources will provide you with a more comprehensive understanding of the roles women play in different societies and historical contexts. It's important to note that perspectives on women's roles may vary across cultures and time.