Definition of collision:
hit, a world of difference, encounter, percussion, butt, impingement, crack-up, shock, kick, pileup, jounce, smasher, foul, car crash, opposition, striking, slam, aquaplane, divergence, contradiction, bang, contact, distinction, blindside, dispute, bump, confrontation, jar, break down, jolt, variation, accident, impact, concussion, interference, knock, hitting, thump, a war of words, crash, strike, bang up, thud, blowout, rap, wallop, variety, diversity, contrast, smash, broadside, conflict, misunderstanding, crackup, argument, blow, clash, smashup, quarrel, disaster, meeting, controversy, clashing, fight.
conflict (part of speech: noun)
- ruin (part of speech: noun)
- discordance (part of speech: noun)