'Destroy' just means to wreck something. ie. I destroy an orange by crushing it with my foot.
'Sabotage' is usually reserved for machinery. It means to tamper with the operation of the machine to prevent proper function. ie. I sabotage a car by altering it's components to prevent it from working as expected.
To pronounce 'sabotage':
The first 'A' is pronounced like in 'cAt'.
The 'O' is pronounced like in 'knOW'.
The 'age' is pronounced like 'lARGE'.
The 's', 'b' and 't' are pronounced with their normal pronunciation.