What is (and is not) a Simulator Game?

Hi,

I started thinking about Simulator games (like American Truck Simulator and Farming Simulator) one time and then this question hit me.
Isnt Call of Duty a shooting simulator basically? we all know the difference between something like a Farming Simulator and a game like Call of Duty but why do we compartmentalize shooters as not simulators?I dont have an answer, I have some possible answers that might work but I dont know really.Anyone have thoughts?

Please help.

I didn't find the right solution from the Internet.

References:
https://www.gamespot.com/forums/games-discussion-1000000/what-is-and-is-not-a-simulator-game-33430517/#4
Motion Graphics Intro Video

Thanks

Call of duty is a first person shooter, not a simulator.