Tap any card to flip it. Filter by category, mark words you know, and track your progress as you go.
These flashcards cover the four core areas of the Vocabulary Building series: prefixes & roots, synonyms & antonyms, idioms & phrases, and formal vs. informal English. Your progress is saved automatically in this browser.
1. Tap any card to flip it and reveal the meaning, an example sentence, and extra detail (like a synonym, antonym, or prefix breakdown).
2. Use the category buttons (All Words, Prefixes & Roots, Synonyms & Antonyms, Idioms & Phrases, Formal vs. Informal) to focus on one area at a time.
3. When you're confident with a word, tap "Mark as Known" on the back of the card — it's saved automatically, even if you close the page.
4. Use "Hide Known" to see only the words you're still learning, or "Shuffle" to mix up the order for extra practice.
5. Once you've worked through the cards, try the quiz below to test how much you've remembered.
10 questions. Select an answer for each, then submit to see your score instantly.