I already answered you in the other post where you asked the same question:
A sim or simulator tries to be as realistic as possible in terms of machine performance and historical facts and usually is quite complex with a steep leaning curve.
A game, is balanced more towards game play and enjoyability. Games usually fore go the more complicated matters for instant action and simplicity.
Examples of a sim and a their game counter parts are:
IL2 - IL2 wings of Prey
Flashpoint / ARMA - Battlefield / Call of Duty
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