Many words have an obvious antonym, such as near and far or over and under.

However, there are quite a lot of words that have more than one antonym. Sometimes this is because the same word can mean different things.

for example:

right (meaning 'correct') and wrong

right (as in 'right hand side') and left

Sometimes there can be more than one antonym for a word with a single meaning. The antonym of open can be either shut or closed.