From Word a Day:
"What's common among the five words (scintillescent, vetitive, rapparee, bilabial, froufrou) featured here this week? If you know the answer, send it to wordsATwordsmith.org (replace AT with @). The first person to identify it wins an autographed copy of the book "Another Word A Day".
-Anu Garg (gargATwordsmith.org)"
Hint: think of Noah's Ark