Clash

1. Opposition; contradiction; as between differing or contending interests, views, purposes, etc.
2. To meet in opposition; to act in a contrary direction; to come onto collision; to interfere.
3. To strike noisily against or together.
4. To make a noise by striking against something; to dash noisily together.
5. A loud noise resulting from collision; a noisy collision of bodies; a collision.