Choose the word which is pronounced differently from the others

Choose the word which is pronounced differently from the others:

2.            winter               hospital                    business                     building

3.            ahead                breakfast                  great                          heavy

4.            produce            pollute                      collect                        volleyball

5.            teachers              thanks                       pupils                        farmers

6.            flow                    throw                         yellow                        plow

7.            look                   school                        book                          room

8.            clothes                oranges                  watches                          glasses

9.            hour                   house                         help                           home

10.       fall                     cat                             plan                           scrap