accident
antagonism
antipathy
antithesis
appulse
backlash
bad blood
belligerence
blow
brunt
bulldozing
bulling
bump
calamity
cannon
carambole
carom
casualty
cataclysm
catastrophe
clash
clashing
competition
concussion
conflict
confrontation
confutation
contention
contradiction
contradistinction
contraindication
contraposition
contrariety
contrariness
contrast
contretemps
counteraction
counterposition
counterworking
crack-up
crankiness
crash
cross-purposes
crotchetiness
crump
crunch
demolishment
contact
difference
difference of opinion
dispute
impinging
striking
collide
assault
complication
crisis
defeat
destruction
disaster
disturbance
earthquake
encounter
explosion
friction
impact
injury
interference
interruption
misunderstanding
quarrel
Parisian
circumcision
decision
derision
division
envision
excision
incision
indecision
misprision
precision
provision
recision
rescission
revision
supervision
vision