harikari vs hara-kiri

harikari and hara-kiri both are nouns.

Word	Noun	Adjective	Verb	Adverb
harikari	Yes	No	No	No
hara-kiri	Yes	No	No	No

As nouns, harikari and hara-kiri are synonyms defined as:

harikari and hara-kiri: ritual suicide by self-disembowelment on a sword; practiced by samurai in the traditional Japanese society

Other synonyms of harikari include harakiri, seppuku.

harikari (noun)	hara-kiri (noun)
ritual suicide by self-disembowelment on a sword; practiced by samurai in the traditional Japanese society	ritual suicide by self-disembowelment on a sword; practiced by samurai in the traditional Japanese society