For some words, their identity is not obvious when you do not know the rules for the changes of sounds between the Indo-European language subfamilies. For inst

For some words, their identity is not obvious when you do not know the rules for the changes of sounds between the Indo-European language subfamilies. For instance "cow" and "Kuh" come from the same word as "boeuf" and "buey" (also despite the gender difference).