• aomething to chew on,
• zomething to chew on,
• xomething to chew on,
• domething to chew on,
• eomething to chew on,
• womething to chew on,
• simething to chew on,
• skmething to chew on,
• slmething to chew on,
• spmething to chew on,
• s0mething to chew on,
• s9mething to chew on,
• sonething to chew on,
• sokething to chew on,
• sojething to chew on,
• somwthing to chew on,
• somsthing to chew on,
• somdthing to chew on,
• somrthing to chew on,
• som4thing to chew on

The adjective form of "something to chew on" could be "challenging" or "thought-provoking".