What?

Today's funniest moment that is hard to translate but I will try anyway;...
H and I are going through some basic Arabic, testing each other and she asks me; 'what's taul' or so it sounded to me. So I think well it must begin with ط because of the somewhat swallowed vowel that sounds somewhere between a T and a D. It must be followed by و which is like a W sound and probably finishes with ل, an L sound. طول. I have no idea what this word is. I give up.
Then I see what she's looking at.
A towel.
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