

彼の話で、教室中に笑いが起きました。
父の冗談に、みんな笑いが止まりませんでした。
笑いは健康にいいって、本当ですか。
"わらい(笑い)" is in the lesson "Emotions" (Level 42), along with 11 other useful words. LinDuo has 180 topic lessons like this one, 2,379 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.