But Allah commanded everything to exist by saying "Be", would that not mean EVERYTHING is the word of Allah then? Why is the term "Word of Allah" applied specifically to Jesus and Jesus alone in the Quran then?

And the Quran does not say Jesus embodied the spirit of Allah, it says He IS the Spirit of Allah. Your prophet also says the same thing about Jesus being the Spirit of Allah in the Hadith.

Are the Word of Allah and the Spirit of Allah part of Allah or outside Allah?