As commented in another discussion you are totally right that the spelling with an accent (
fùil) is incorrect and it should be fuil. The contributors are aware of that, will fix it in the future (although it will take a while) and for the time being this is explaines in the Animals skill’s tips and notes:
CORRECTION - Fuil (blood) is spelled with an accent on the 'u' in this skill, which is incorrect. We have earmarked it to be fixed, but that requires us to create a new version of the current tree. As soon as we are able to, we will change this. The pronunciation in the sound files is still correct. Thanks for your patience!