The Question keeps arising: What is a scientist?
According to the American Heritage Dictionary of the English:
Scientist – definition of scientist by The Free Dictionary
A person who is engaged in and has expert knowledge of a science, especially a biological or physical science. American Heritage® Dictionary of the English
Scientist – Wikipedia, the free encyclopedia
A scientist, in a broad sense, is a person engaging in a systematic activity to acquire knowledge. In a more restricted sense, a scientist may refer to an individual who uses the scientific method. The person may be an expert in one or more areas of science.
Scientist – Simple English Wikipedia, the free encyclopedia
A scientist is a person who studies or has expertise in science. A scientist tries to understand how our world, or other things, work. Scientists make observations, ask questions and do extensive research work in finding the answers to these questions.
What is a scientist? – Canadian Science Publishing
10 Feb 2015 – A scientist is someone who wears a lab coat 24/7, right? Who speaks in a language the public can’t understand, and who’s a nerd to the nth …
scientist
professor

noun
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a. A college or university teacher who ranks above an associate professor.b. A teacher or instructor.
- One who professes.
And according to the good old Oxford English Dictionary.
A Professor is one who teaches his profession.