Nouns

(n)clang, clangor, clangour, clangoring, clank, clash, crasha loud resonant repeating noise“he could hear the clang of distant bells”
(n)clash, frictiona state of conflict between persons
(n)clasha state of conflict between colors“her dress was a disturbing clash of colors”
(n)brush, clash, encounter, skirmisha minor short-term fight

Verbs

(v)collide, clashcrash together with violent impact“The cars collided”, “Two meteors clashed”
(v)clash, jar, collidebe incompatible; be or come into conflict“These colors clash”
(v)clashdisagree violently“We clashed over the new farm policies”