Antithesis (noun)

A direct or exact opposite, a contrasting relationship between two things.

Origin:

From greek antithesis, meaning "opposition, contrast".

Examples:

1. The antithesis of good is evil.
2. The city and the country are the antithesis of each other.
3. His speeches are filled with antithesis, highlighting the differences between his ideas and his opponents.
4. The poem's imagery creates an antithesis between light and dark.
5. The president"s policy is the antithesis of his predecessor"s.