Definition of clash :
1. A loud noise resulting from collision; a noisy collision of bodies; a collision.
2. Opposition; contradiction; as between differing or contending interests, views, purposes, etc.
3. To make a noise by striking against something; to dash noisily together.
4. To meet in opposition; to act in a contrary direction; to come onto collision; to interfere.
impact, shake up, opposition, thicket, detrition, coming upon, showdown, contact, concussion, clank, jolt, face-off, clashing, wreck, crash, jar, light touch, smash, brushing, meeting, brushwood, clang, brush, clangor, clangoring, rubbing, clangour, coppice, agree, skirmish, collapse, copse, shock, disaccord, bump around
difference (part of speech: noun)
difference, diversity, distinctness, disparity, aberration, disunity, dissimilarity, discrepancy, contrast, contradiction, variance, mismatch, divergence, variety, asymmetry, counterpoint, dissemblance, deviation, inequality, variation, non-uniformity, conflict, abnormality, distinction
contend (part of speech: verb)
disagree (part of speech: verb)
disagreement (part of speech: noun)
confrontation (part of speech: noun)
contrast (part of speech: verb)
conflict (part of speech: verb)
enmity, squabble, commotion, tension, contention, blast, hubbub, raucousness, clamor, squall, riot, disagreement, broil, row, spar, disharmony, dissent, antipathy, brawl, antagonism, friction, harshness, feud, differ, antagonize, hostility, strife, warfare, altercate, collision, altercation, contend, discordancy, hassle, discord, animosity, bicker, dissension, collide, disagree, dissidence, imbroglio, dissonance, cacophony
- The barn was a clash of violent lights and impenetrable shade. - "Peccavi", E. W. Hornung.
- The conversation was interrupted by a commotion from without; the sound of horses' hoofs, the cries of men and the clash of arms. - "The Outlaw of Torn", Edgar Rice Burroughs.
- If the souls of lives were voiced in music, there are some that none but a great organ could express, others the clash of a full orchestra, a few to which nought but the refined and exquisite sadness of a violin could do justice. - "My Brilliant Career", Miles Franklin.