Explanation:

- A goldsmith is a craftsperson who makes or repairs jewelry. Their expertise is in shaping and creating intricate designs out of precious metals and stones.

- The word "Jewellery" is related to "Goldsmith" because it represents the product they create.

- A cobbler is a professional who repairs and mends shoes. This is their area of expertise.

- Option 1: Plastic: This material is not relevant to the specific work of a cobbler.

- Option 2: Shoes: The correct choice as shoes are what the cobbler specifically works on.

- Option 3: Rubber: While cobblers may use rubber, it's not exclusive or specific to their craft.

- Option 4: Leather: Though often used by cobblers, it doesn’t fully capture the essence of their work like shoes do.