考え方 · The idea
空 + 港 = airport, before you've ever met the word. Every dictionary word built only from kanji you know is already a word you can read.
reachable words at 400 kanji
3,000 reachable words at 400 kanjiWhy words from your kanji stick
覚えやすい
Easy to remember
You already know each piece. A word like 空港 takes a glance, not a week of flashcards.
思ったより多い
More than you think
Most learners never see this number. Seeing how many words you can already read gives your reading a real push.