Synonyms for Clash:

n.

at the same time, meanwhile, as, all the time, together, simultaneous, while, when, concurrent, even as. misunderstanding, a war of words, controversy. a world of difference. cavil, haggle, fight it out, dicker. caterwaul. blare, beep, burst, clack, bang, clamour, boom. fight, fist fight, running battle, fighting. duke, square off, tangle with, grapple. championship, card, cup, close season, bye, the Commonwealth Games, crown. grotesque, eyesore, monstrosity, sight, excrescence, a blot on the landscape, horror. ride, play, enter, take up, represent, race, duel, meet. look awful, look like a bomb has hit it, cut a fine/ridiculous etc. figure. clank (noun)
clang.
clash (noun)
clangoring, friction, clang, crash, clangor, clank, skirmish, jar, collide, clangour, brush, encounter.
conflict (noun)
contention, collision, friction, commotion, raucousness, tension, disharmony, altercation, Discordancy, cacophony, antipathy, strife, disagreement, hostility, antagonism, harshness, discord, imbroglio, dissension, dissonance, warfare, enmity, hubbub, squall, hassle, dissidence, animosity.
confrontation (noun)
defiance, engagement, confrontation.
difference (noun)
counterpoint, discrepancy, dissimilarity, asymmetry, mismatch, variation, distinction, variance, contrast, non-uniformity, inequality, divergence, disunity, conflict, disparity, Dissemblance, diversity, abnormality, distinctness, deviation, aberration, variety, difference, contradiction.
disagreement (noun)
argument, disaccord.
disagreement or fight, often brief (noun)
brawl, broil, collision, engagement, skirmish, crash, riot, encounter, argument, row, discord, brush, conflict, misunderstanding, jar, dispute, disharmony, confrontation.

v.

conflict (verb)
disagree, bicker, differ, row, riot, broil, contend, antagonize, feud, squabble, clamor, blast, dissent, spar, altercate, brawl, collide.
contact (verb)
collide.
contend (verb)
encounter, struggle, resist, wrestle, vie, quarrel, argue, defend, confront, oppose, wrangle, protest, face, withstand, dispute, stand.
contrast (verb)
diversify, differentiate, contradict, diverge, deviate.
disagree (verb)
defy, complain, object, reject, challenge, repudiate, demur.
do not match (verb)
disaccord, mismatch, contrast.
fight about, often verbally (verb)
quarrel, disagree, contend, wrangle, grapple, feud, argue, differ.
hit with a loud noise (verb)
bang, clank, collide, clang.

Other synonyms:

go with, caterwaul, fight, go together, come with, coincide, eyesore, blare, monstrosity, the Commonwealth Games, dicker, cavil, haggle, fist fight, beep, clack, disaccord. concur, fighting, bye, accompany, synchronize, overlap, running battle, close season, controversy, excrescence. duel, race, championship. argument. horror. bang, boom. cup. meet. card, crown. contend
tangle with.
disagree
haggle, quarrel, altercate.
Other relevant words:
clack, clangour, jar, eyesore, bye, race, clangoring, fight, clank, argument, duel, meet, controversy, burst, disaccord, clang, blare, championship, skirmish, brush, bang, crash, card, misunderstanding, haggle, fighting, clangor, cup, crown, synchronize, grapple, clamour, dicker.

Usage examples for clash

  1. The rocks no longer dashed together; each remained fixed in its place, for it was the will of the gods that these rocks should no more clash together after a mortal's ship had passed between them. – The Golden Fleece and the Heroes who Lived Before Achilles by Padraic Colum
  2. There was a sudden clash of arms off to their left. – ...After a Few Words... by Gordon Randall Garrett