harikari vs self-destruction

harikari and self-destruction both are nouns.

Word	Noun	Adjective	Verb	Adverb
harikari	Yes	No	No	No
self-destruction	Yes	No	No	No

As nouns, self-destruction is a hypernym of harikari; that is, self-destruction is a word with a broader meaning than harikari:

harikari: ritual suicide by self-disembowelment on a sword; practiced by samurai in the traditional Japanese society
self-destruction: the act of killing yourself

Other hypernyms of harikari include self-annihilation, suicide.

harikari (noun)	self-destruction (noun)
ritual suicide by self-disembowelment on a sword; practiced by samurai in the traditional Japanese society	the act of killing yourself
	the act of destroying yourself