Korean vs Japanese: Which Has the Bigger Vocabulary?
Dictionary headwords, active vocabulary, and synonym richness compared
"Which has more words, Japanese or Korean?" is surprisingly hard to answer.
Dictionary Headword Counts
Korean: Standard Korean Dictionary ~510,000 headwords
Japanese: Kojien ~250,000 / Nihon Kokugo Daijiten ~500,000
Numbers look similar or slightly favoring Korean, but heavily influenced by counting methodology.
Why Simple Comparison Is Difficult
Korean tends to register derivatives as separate entries. "먹다 (eat), 먹이다 (feed), 먹히다 (be eaten)" each get their own entry.
Japanese can infinitely create new words through Kanji combinations. From 食(shoku): 食事, 食品, 食堂, 食中毒... Many Kanji compound words used daily aren't even in dictionaries.
Active Vocabulary Comparison
Daily conversation vocabulary is similar: ~3,000-5,000 words. Educated adult vocabulary: ~50,000-80,000.
Differences exist in onomatopoeia systems, Kanji compound freedom (favoring Japanese for technical terms), native word usage rates, and loanword absorption (Japanese absorbs far more English loanwords).
Key Points
Dictionary entries: Korean 510k vs Japanese 250k (Kojien) / 500k (Nihon Kokugo)
Korean registers derivatives separately; Japanese Kanji compounds often unregistered
Daily vocabulary ~3,000-5,000 words — similar both sides
Japanese = high Kanji combo freedom / Korean = higher native word ratio