Rupture
Part of speech: noun
Definition: A burst, split, or break. A social breach or break, between individuals or groups. A break or tear in soft tissue, such as a muscle. A failure mode in which a tough ductile material pulls apart rather than cracking.
Part of speech: verb
Definition: To burst, break through, or split, as under pressure.
Rift
Part of speech: noun
Definition: A chasm or fissure.
Part of speech: verb
Definition: To form a rift.To belch.
Example sentence: If there's a rift in the marriage - if someone feels neglected, frustrated, tempted by others, or unsure - then trouble can easily arise.