Wow guys (not all of you, but some)....Please, before answering a question, do some research.
In some dictionaries, the definition is the same, in others it is different. However the connotation of the word is what is important.
When a person hears the word illusionist, the most common thing that is thought of is Copperfield, grand stages, sawing people in a half, and "Grand Illusion", however the word "magician" usually carries a general connotation used interchangeably with words/phrases such as "sleight of hand artist", "manipulator", "close-up artist", and "Illusionist" itself.
You see, the denotation of a word can be different than its connotation... This is particularly true with the above.
Have fun with magic my "brotha"
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~David Rysin