I believe there is an error when explaining hymography. Based on your explanation, hymography are words that are spelled the same but are pronounced differently. The example states otherwise as lead (the metal) and led (the past tense of lead) concludes otherwise. Doesn't that indicate that they are pronounced the same but spelled differently? Please correct me if I'm wrong.
Great Video! As part of an official university project my supervisor would like to ask you about being allowed to use your video for educational purposes on the university's e-learning platform. If you could provide me with an email my professor can write to, I would massively appreciate your consideration :).