Final answer:
The correct 6-letter word for a large and protruding belly is 'paunch,' which is unrelated to any television character.
Step-by-step explanation:
A 6-letter word for a large and protruding belly, which is not related to Erik Estrada's "CHiPs" character, is commonly known as paunch. The correct answer is d) Paunch. The other options provided, such as niche, notch, and notion, do not match the definition of a large and protruding belly. 'Paunch' specifically refers to a bulging belly or abdomen.