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How easy is Korean for Japanese speakers?

Going from Japanese to Korean (한국어) has a composite linguistic distance of 71% (curated lexical data). Below is the dimension-by-dimension breakdown.

71% distance FSI Cat IV (Hardest) — ~2,200 hours
Lexical similarity
15%

Shared vocabulary, cognates, and loanwords.

Grammatical distance
96%

Morphology, syntax, word order, cases.

Phonological similarity
0%

Shared sounds and phoneme inventory.

Writing-system match
0%

Japanese → Hangul

Genealogical kinship
0%

Japonic ↔ Koreanic

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Other easy languages for Japanese speakers

The 5 languages with the lowest linguistic distance from Japanese:

Think you can tell them apart?

A quick 3-question check between Japanese and Korean. No signup.