Explanation

A benefactor is a person who gives money or other help to a person or institution.

A malefactor is someone who commits unlawful acts or breaks the law.

An actor is someone who performs a role in a play, film, or broadcast.

A contractor is a person or company that enters into a contract to provide goods or services. 

Explanation

Omniscient ہر چیز کا علم رکھنے والا 

To be omniscient is to know everything.

This often refers to a special power of God.

If you combine the Latin roots omnis (meaning "all") and scientia (meaning "knowledge"),

You'll get omniscient, meaning "knowledge of all."

Explanation

Cosmology is the called the study of Universe. 

Edwin Powell Hubble is called the father of Cosmology.

COSMOLOGY means علم کائنات

Explanation

 Laboratory:

A lab is a facility for scientific research, experiments, and measurements.

Library:

A library is a collection of books and other media and a space for reading and studying.

Gymnasium:

A gymnasium (or gym) is an indoor venue for exercise, sports, and physical education. 

Explanation

A feminist is someone who supports equal rights for women.