This answer got me wondering how relevant the presentation in 万葉仮名 is to finding a 漢字 for a given word.
As far as I understand, 万葉仮名 are used largely for phonetic value. Knowing that some word was written with some combination of 万葉仮名 would only carry any significance if words were written consistently with the same characters. Do texts in 万葉仮名 indeed choose 万葉仮名 consistently or is a lot of the choice a stylistic choice on part of the author?