opposer

Synonyms:

adversary, antagonist, opponent, resister

Antonyms:

agonist

someone involved in a contest or battle (as in an agon)

Examples:

Antichrist

(Christianity) the adversary of Christ (or Christianity) mentioned in the New Testament; the Antichrist will rule the world until overthrown by the Second Coming of Christ

Types:

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dueler, duelist, dueller, duellist

a person who fights duels

enemy, foe, foeman, opposition

an armed adversary (especially a member of an opposing military force)

Luddite

any opponent of technological progress

withstander

an opponent who resists with force or resolution

besieger

an enemy who lays siege to your position

Type of:

individual, mortal, person, somebody, someone, soul

a human being