How to learn Spanish vocabulary (and actually remember it)

Why Spanish words don’t stick

You look a word up, it makes perfect sense, and a day later it’s gone. That’s not a failure of effort — it’s how memory works. Every new word starts fading almost immediately unless something pulls it back. Re-reading a list feels productive but does little; the word slides from “I recognise it” to “I can actually use it” only when you retrieve it and meet it in context, repeatedly, over time.

So a method that works has to do three things: teach the right words, teach them in use, and bring them back at the right time.

1. Start with the most common words

Spanish has hundreds of thousands of words, but you don’t need most of them. The 1,000 most frequent words cover roughly 88% of everyday speech, and 2,000–3,000 is enough for comfortable conversation. Which words you learn matters far more than how many, so begin at the top of a frequency list — ser, estar, casa, hacer, bueno — and work down.

See how many Spanish words you really need →

2. Learn each word inside a sentence

A flashcard that says feliz = happy teaches a translation. It doesn’t teach that you say estoy feliz, not soy feliz, for a passing mood. Learning a word in context gives you meaning, grammar and the words it naturally pairs with, all at once.

3. Review with spaced repetition

Once you’ve met a word, the trick is to see it again just before you’d forget it — then a little later, then later still. That’s spaced repetition, and it’s the single highest-leverage habit in vocabulary learning. Done by hand it’s fiddly; done by an algorithm it’s effortless.

4. Keep it to ten words at a time

Ambition kills more study streaks than laziness. Ten new words at a time adds up fast — roughly 70 a week and over 3,000 a year — well into conversational range, without burning out. A small, fixed batch is easy to protect and easy to keep.

How 10 Words puts this into practice

10 Words is built on exactly these principles. Every word arrives inside a real example sentence with its translation, and you complete it by typing the missing word into a crossword grid — active recall and context in a single tap. Behind the scenes, FSRS tracks how well you know each word and schedules it to return at the right moment. Words are introduced in frequency order, so your first ten words are the vocabulary you'll actually meet the most.