I was going to write the same thing. I reported it, but not sure it's the correct place to do so.
"This horse is convenient." was marked as an incorrect answer, why? How do you know if the meaning of "נוח" is comfortable or convenient? They give very different meanings to the sentence.
Ever wonder that the guy who built and sailed the Ark was named Noah, which means 'at rest', or, nautically, 'becalmed'.