Onomatopoeia for the sound effect associated with an incorrect answer.

an audition

Alternative form of プライヤ (puraiya, “pliers”)

Christmas card

calorie

itinerary / course (stage of a meal) / racecourse

costing no money / unbound by promises or contracts / independent of any system / without something

freedom in the above senses

number / (specifically) license plate (ナンバープレート) number

circle (geometric shape) / circle (group of people with a common goal or interest) / circle (group that produces dōjin works)