If you speak English, you already know thousands of Japanese words. They are written in katakana and they are called 外来語 (gairaigo), loanwords. コーヒー, テレビ, ホテル, スマートフォン, コンピューター: these are not Japanese inventions, but borrowed words reshaped to fit Japanese sounds.
For learners whose first language is English, they are a gift. For learners whose first language is not English, they can still be a shortcut once you learn the transformation rules. And for everyone, they come with a few traps.
Step 1: Be comfortable reading katakana
Before loanwords help you, katakana has to be automatic. If you are still slow with the script, it is worth a few focused sessions first. A quick reminder of how it compares to hiragana is in hiragana vs katakana.
A tip for reading katakana quickly: read the words aloud, as if you were an English speaker with a strong accent. Half the time the word will pop out.
Step 2: Learn the sound-change patterns
Japanese syllables are mostly consonant plus vowel, and there are not many consonant clusters. English words get adjusted to fit.
Added vowels
Extra vowels (usually お or う) separate consonant clusters:
- strike → ストライク (su-to-ra-i-ku)
- desk → デスク
- bread → ブレッド
Long vowels
The long mark ー extends vowels:
- coffee → コーヒー
- computer → コンピューター
- cake → ケーキ
Sounds that Japanese lacks
- l and r both become ラ行: light and right are both ライト.
- v often becomes ブ or ヴ: video → ビデオ.
- th becomes ス or ザ: thank you → サンキュー.
Final consonants
Final consonants get a vowel: bed → ベッド, bus → バス, milk → ミルク.
Once you internalize those rules, you can often guess an unfamiliar word on sight. ハンバーガー is hamburger, レストラン is restaurant, アパート is apartment.
Step 3: Watch for false friends
Not every loanword means what you think. Some have shifted meaning, others were invented in Japan from English parts (和製英語, wasei-eigo).
| Japanese | Looks like | Actually means |
|---|---|---|
| マンション | mansion | apartment/condominium |
| サービス | service | free extra, good customer service |
| ストーブ | stove | heater |
| クレーム | claim | a complaint |
| ハンドル | handle | steering wheel |
| コンセント | consent | electrical outlet |
| ノートパソコン | — | laptop computer |
| ガソリンスタンド | — | gas station |
When you meet a katakana word, check the meaning at least once. If the English guess seems odd in context, you have probably met a false friend.
Step 4: Use loanwords to grow your vocabulary faster
Here is a practical way to turn this into study results.
- Collect. Whenever you see a katakana word on a menu, sign, or app, note it.
- Decode. Guess the English origin before looking it up.
- Verify. Check the Japanese meaning. Mark false friends.
- Review. Put the ones you could not guess into a spaced review deck. See spaced repetition for JLPT vocabulary and kanji.
This also pairs well with learning to type quickly. If you want katakana to feel natural, typing in Japanese is an excellent way to practice recognition and recall.
What about learners who don't speak English?
If your native language is Chinese, Korean, or Vietnamese, you have a different advantage with kanji vocabulary, and loanwords still help as a second route. Many tech and food terms are shared across languages. For more on how your first language can help, see studying Japanese in your native language.
Loanwords on the JLPT
You will see katakana vocabulary throughout the exam:
- Vocabulary questions that test reading or meaning of a katakana word.
- Orthography questions at higher levels about writing katakana correctly (long vowels, small っ, small ャ・ュ・ョ).
- Reading passages about everyday life, shopping, and technology.
- Listening, where loanwords are spoken with Japanese pronunciation. That is a very different sound from English, so practice hearing them.
The most common mistakes are missing a long vowel or a small っ. コーヒ is not コーヒー, and バック is not バッグ. Two words, two different meanings (back vs bag).
A five-minute daily habit
Choose one place you see Japanese text every day (a convenience store, a shopping app, a train map) and decode three katakana words per day. In a month, that is about ninety words, learned almost for free.
For the larger picture of how vocabulary fits into the JLPT, the JLPT preparation guide is a helpful reference. JLPT Ready's Learn section organizes vocabulary by chapter with plain-language explanations, and you can start free with N5 to try it.