I'd agree. I got stuck after getting SYRUP because I just assumed YACK wasn't a word.
yack n 1: noisy talk [syn: {yak}, {yack}, {yakety-yak}, {chatter}, {cackle}]
v 1: talk incessantly and tiresomely [syn: {yack}, {jaw}, {yack
away}, {rattle on}, {yap away}]