Here are some other words for scientist, depending on the specific field or context:

General terms:

* Researcher

* Scholar

* Academic

* Expert

* Investigator

* Analyst

* Discoverer

* Innovator

Specific fields:

* Biologist

* Chemist

* Physicist

* Astronomer

* Geologist

* Zoologist

* Botanist

* Paleontologist

* Psychologist

* Sociologist

* Anthropologist

Informal terms:

* Brain

* Genius

* Whiz

* Expert

The best word to use will depend on the specific situation and the level of formality you need.