I was trying to make a semantic difference like between Russian words советник (one who occupies the position where he gives advices) and советчик (someone who made an advice) and used advisor for the first and adviser for the second. Yet my dictionary says there is no semantic difference between the two.
I wonder whether indeed there is no semantic difference and if so, what words to choose to indicate the difference (like between asker and questioner).
PS. This is not about -ter- vs -tor- and it seems the -ter- vs -tor question had been answered wrongly so I made a new answer to that question.