Hara-kiri and Self-annihilation

Hara-kiri noun - Ritual suicide by self-disembowelment on a sword; practiced by samurai in the traditional Japanese society.

Self-annihilation and hara-kiri are semantically related. In some cases you can use "Self-annihilation" instead a noun phrase "Hara-kiri".

Self-annihilation noun - The act of killing yourself.

Hara-kiri and self-annihilation are semantically related. Sometimes you can replace phrase "Hara-kiri" with "Self-annihilation", this phrases are similar.