Merriam-Webster Online Dictionary
collision (noun)1.
an act or instance of - colliding clash
2.
an encounter between particles (as atoms or molecules) resulting in exchange or transformation of energy impact
Merriam-Webster Online Thesaurus
collision (noun)1.
a forceful coming together of two things
SYNONIMS:
bump, collision, concussion, crash, impingement, jar, jolt, jounce, kick, shock, slam, smash, strike, wallopRELATED WORDS:
blow, buffet, hit, knock, punch, rap, slap, thump; bashing, battering, bludgeoning, clobbering, hammering, lambasting, licking, pounding, pummeling ( pummelling), thrashing; contact, encounter, meeting, touch2.
the violent coming together of two bodies into destructive contact
SYNONIMS:
collision, concussion, crack-up, smash, smashup, wreckRELATED WORDS:
accident, pileup; demolishment, destruction, ruin