As a general answer to the question, the two approaches you might take for a paper like this would be to look at the etymology of the words (mostly on a descriptive level), or to try to explain how the terms are applied metaphorically from one domain to another. The second option could be more theoretical, and you could go into a lot of technical detail if you wanted in terms of setting up the two domains and how the terms are transferred between them. That would be based on theories of metaphor in Cognitive Linguistics, so you could start reading about that if you want.
