antithesis (n.)

• antagonism
• antipathy
• antipode
• antipodes
• antonym
• collision
• con
• conflict
• confrontation
• contention
• contra
• contradiction
• contradictory
• contradistinction
• contraindication
• contrariety
• contrary
• contrast
• converse
• counter
• counterbalance
• countercheck
• counterpoint
• counterpoise
• disagreement
• discrepancy
• foil
• hostility
• inconsistency
• inverse
• obverse
• offset
• opposite
• oppositeness
• opposition
• perversity
• polarity
• polarization
• repugnance
• reverse
• setoff
• showdown
• vis-a-vis