In which stories are the Heffalump and the Woozle creatures that confuse the characters?

Which word names both a heavy scarf worn against the cold and a device that reduces car noise? Which heavy twill fabric is used for jeans and other work or leisure garments? Which Hebrew name for God is represented by the four letters YHWH? Which "Hee Haw" regular, known for her straw hat with a dangling price tag, died in Nashville in 1996? A Heisman Trophy winner at Oklahoma State, who was NFL Offensive Rookie of the Year in 1989 with the Detroit Lions? Complete the title of Helen Fielding's bestseller: "___'s Diary". Which word is slang for both a helicopter and a customized motorcycle? A helixophile collects which wine-drinking accessories?