alternative

alternative 1

•  adjective

1    an alternative plan, idea etc can be used instead of another one:
?The main road is blocked, so drivers should choose an alternative route.

2    different from what is usual or accepted:
?an alternative lifestyle
?alternative medicine

 alternative 2

• noun [C]

something you can choose to do or use instead of something else:
?Before you spend a lot of money on gas central heating, consider the alternatives.
?alternative to: Many farmers are now growing maize as an alternative to wheat.
?have no alternative but to do sth (= when you cannot choose to do anything else)
I have no alternative but to report you to the police.