x86 assembly language is to an x86 processor as;
The x86 processor executes machine code (I think actually some of the "backwards compatibility" in an x86 processor is provided by a scripting-like-language implementation on the chip but that's invisible to the assembly language programmer so not part of this discussion).
So I think you'd have to say that:
x86 machine code is to an x86 processor
x86 assembly language is to x86 machine code as;
But getting back to the original analogy, I think it would be better stated as: