opponent, enemy, adversary, foe

be opposed to

oppose, dissent, go against, resist

to oppose, to contravene

enmity, hostility

oppositions

stance of opposition,in contravention, contrary

opposite, opponent

Pros and cons, arguments for and against.

contrary wind, foul wind, wind blowing in the opposite direction

opposition, opposition party

briskness, fierceness of opposite wind

opposite side, an opposition

opposite genders