We could turn this thread into a very practical discussion about Energy - which is quite valid, I think.Can all sorts/types of energy translate into some other kind? Heat for example.
Is there a hierarchy in this "translation"? Is heat the lowest form or state of energy?
Heat Engines (the general term for a device to obtain mechanical work from the flow of heat) work best (higher efficiency) between large temperature differences. Once the work has been 'extracted' from a mass of (say) steam and the steam has condensed, you can sill get some work out of it by using a cold sink at an even lower temperature than 100C BUT NOT MUCH. So you could say that the energy in the condensed steam is a 'lower grade' than that of the superheated steam that is supplied by the original boiler.
The hot water would still be 'useful' for heating but not so much for doing work.
It's basically down hill all the way, though.
Your suggested "hierarchy" is ok as an arm waving term and if you want to talk in terms of relative usefulness. Considerations like possibilities of storing for the various forms of energy are very relevant sometimes. You could perhaps put Mechanical Potential Energy at the top because you can store large amounts of water at height or use a wound spring to store useful energy.