OPPOSITES

An opposite is a word having a meaning opposite to that of another word. 

For example, 

1. The word wet is the opposite of the word dry.
2. The word black is the opposite of the word white.

Whilst some words change completely when we write their opposites, like for example: good - bad. Some other words do not change but un or im is added to the words. 

For example, 

1. The word unlock is the opposite of the word lock. 
2. The word incorrect is the opposite of the word correct.

What's the opposite?

Opposites