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Real freethinker. has written:

'Mess'rs Green and Russell' -- subject(s): Bible, Broadsides, Commentaries

'He' is known as a freethinker.

freethinker, irreligionist, unworshipper, unbeliever, rationalist

An atheist is simply someone who does not believe in a god or gods.

A freethinker is someone with a philosophical viewpoint that holds that opinions should be formed on the basis of logic, reason and science and not authority, tradition, or other dogmas.

So, while the term "atheist" only answers the question of belief in gods, the term "freethinker" describes a person's philosophical viewpoint. In short, yes, you can be both an atheist and a freethinker.