Vocabulary consisting only from characters you are able to read

kanji kana meaning randomReload
無駄 muda futility/uselessness/pointlessness/(P)jlpt3
動物 doubutsu animaldoubutsu, jlpt5
最大公約数 saidaikouyakusuu the highest common factormath
名刀 meitou slavný meč, výtečný mečleda1, sensou
大変な taihen na tough, awfuladj, jlpt3