Recognition is not retrieval
Two abilities get called knowing a word. The first is identifying it when it appears; the second is producing it when you need it. They are trained differently and they decay differently.
List study trains the first, because the format always supplies the word and asks for the meaning. Conversation demands the second, which is why learners with large passive vocabularies still speak in simple sentences.
The fix is not more words. It is practising in the direction you actually need.
| Activity | Trains | Transfers to speech |
|---|---|---|
| Reading a word list | Recognition | Weakly |
| Seeing the word in reading | Recognition | Weakly |
| Recalling meaning from a card | Recognition | Weakly |
| Recalling the word from meaning | Retrieval | Well |
| Using it in a sentence you built | Retrieval | Strongly |
| Needing it and failing | Creates a cue | Strongly |
The last row is counterintuitive and reliable. Failing to retrieve a word makes the subsequent learning of it noticeably more durable.
What a list leaves out
A list gives a word and a gloss. What it omits is how the word behaves: which particle follows it, which verbs it pairs with, whether it sounds stiff in conversation, and what register it belongs to.
That information is most of what using a word correctly requires, and it comes from meeting the word inside sentences rather than beside a translation.
| Japanese | Romaji | Meaning |
|---|---|---|
| 約束を守る | yakusoku o mamoru | To keep a promise |
| 時間を守る | jikan o mamoru | To be punctual |
| 約束を破る | yakusoku o yaburu | To break a promise |
| 気をつける | ki o tsukeru | To be careful |
| 気が付く | ki ga tsuku | To notice |
| 気にする | ki ni suru | To worry about |
Building a deck from your own gaps
The most valuable vocabulary list you can hold is the one made of words you have already demonstrated a need for. It is short, it is personal, and every entry arrives with the memory of a moment you could not finish a sentence.
Unihongo builds this automatically after each session in the 3D classroom: the words you reached for and could not find, the ones you substituted clumsily, the ones the AI Sensei supplied for you. That deck is typically ten to twenty cards and is worth more than a hundred from a frequency list.
It also stays aligned with your actual life, because it is generated from the situations you chose to practise.
- Review the session deck the same day, while the moment is fresh.
- Use each word deliberately in the next session.
- Retire a card once the word arrives without effort.
- Keep the deck under thirty cards; prune rather than accumulate.
- Note the sentence you failed, not just the word.
The last point matters most. A word stored with the sentence that needed it retrieves far better than the same word stored alone.
Combining both sources
Personal decks have a weakness: they only contain what your own conversations happened to require, which leaves systematic gaps. Lists fix that, which is why the answer is both rather than either.
The workable split is to use lists for breadth and sweep them quickly, and personal decks for depth and review them carefully.
| Source | Use it for | Review style |
|---|---|---|
| Level or frequency list | Coverage | Fast sweeps, recognition only |
| Reading you enjoyed | Natural exposure | Note a few, do not harvest all |
| Session gap deck | Speaking ability | Daily, production direction |
| Work or life specifics | Immediate need | Until automatic, then retire |
Making a word yours
A word becomes usable at roughly the point where you have produced it in three different sentences of your own. Before that it is borrowed; after it, it is available.
This is why the step of deliberately using new words in the next session matters more than the review itself. Review maintains a memory; use converts its type.
The practical routine is small: pick three words from the deck before a session and make sure each one appears at least once.
| Japanese | Romaji | Meaning |
|---|---|---|
| その言葉を使ってみます。 | Sono kotoba o tsukatte mimasu. | Let me try using that word. |
| この言い方は自然ですか。 | Kono iikata wa shizen desu ka. | Is this phrasing natural? |
| 他の言い方はありますか。 | Hoka no iikata wa arimasu ka. | Is there another way to say it? |
| どんな時に使いますか。 | Donna toki ni tsukaimasu ka. | When is it used? |
| 会話でも使いますか。 | Kaiwa de mo tsukaimasu ka. | Is it used in conversation too? |
| 少し硬いですか。 | Sukoshi katai desu ka. | Is it a little formal? |
The last two questions catch the most common error with words learned from reading: using written-register vocabulary in speech, where it sounds oddly stiff.
How much vocabulary you actually need
Learners consistently overestimate the vocabulary required to hold a conversation and underestimate the fluency required. A thousand words used instantly produces better conversations than five thousand used slowly.
That ratio argues for depth over accumulation, especially in the first year. The words that matter are the ones your own life demands, and those number in the hundreds rather than the thousands.
Expand deliberately when a new situation forces it, and let the rest arrive through reading over time.
If your deck is growing faster than your speaking is, the deck is the problem. Prune it to what you actually say.