breach / breech
A break in a wall, a law, or a duty versus the rear of a gun or a birth.
A breach is a gap or a violation: a breach in the wall, breach of contract. Breech is the back end of a gun, or a birth in which the feet or rear come first: breech birth. Do not write breech of contract.
Examples
UseThat was a breach of contract.
UseIt was a breech birth.
Avoida breech of contract