Oh, out of the English word! Those might be "pafarkojn" in Esperanto.
as "bov" relates to "cow", do we have a reference to udders here? In any case, I now have a great mnemonic!
The 'l' makes the difference. Bovo is cow. There is no reference to cows nor udders.
bowl = bovlo
You don't need "Ĉu" when you have a different question word: "Kiu." http://en.lernu.net/lernado/gramatiko/konciza/demandoj.php