collision (n.)
- accident
- antagonism
- antipathy
- antithesis
- backlash
- belligerence
- blow
- brunt
- bump
- calamity
- cannon
- carom
- casualty
- cataclysm
- catastrophe
- clash
- competition
- concussion
- conflict
- confrontation
- confutation
- contention
- contradiction
- contradistinction
- contraindication
- contrariety
- contrariness
- contrast
- contretemps
- counteraction
- crack-up
- crankiness
- crash
- crotchetiness
- crunch
- destruction
- dilapidation
- disagreement
- disaster
- discrepancy
- dissension
- dissent
- encounter
- enmity
- fractiousness
- friction
- grief
- hammering
- hate
- hatred
- hostility
- impact
- impingement
- inconsistency
- interference
- jar
- jolt
- kick
- malevolence
- malice
- malignity
- meeting
- misadventure
- mischance
- misfortune
- mishap
- negativeness
- nonconformity
- obstinacy
- onslaught
- oppositeness
- opposition
- percussion
- perverseness
- perversity
- pileup
- polarity
- quarrelsomeness
- ramming
- reaction
- recalcitrance
- recoil
- refractoriness
- repercussion
- repugnance
- resistance
- revolt
- rivalry
- ruin
- shipwreck
- shock
- showdown
- sideswipe
- smash
- smash-up
- smashing
- spite
- spitefulness
- thrusting
- tragedy
- wreck
