antagonism
anteposition
antipathy
antipode
antipodes
antipole
antonym
clashing
collision
con
conflict
confrontation
confrontment
contention
contra
contradiction
contradictory
contradistinction
contraindication
contraposition
contrariety
contrary
contras
contrast
converse
counter
counterbalance
countercheck
counterpoint
counterpoise
counterpole
counterposition
counterterm
cross-purposes
disagreement
discrepancy
foil
hostility
inconsistency
inimicalness
inverse
obverse
offset
opposing
opposite
opposite number
oppositeness
opposition
antitheses
rhetorical device
antithetical
allegory
analogy
clarity
dilemma
dualism
incongruity
metaphor
paradox
parallelism
perversion
retort
sally
similarity
verity