This question already has an answer here:
Lets take the semi-literal-translations
Wing + Levitate --> not really sure but whatever
Levitate + body --> body fly
So presumably Levicorpus can be used on bodies only.
But then why does Levicorpus exist? Draco, in the Cursed child, uses Wingardium Leviosa on a body, so why would Levicorpus exist?