Vocabulary consisting only from characters you are able to read

kanji kana meaning randomReload
黒星 kuroboshi (1)black spot/black dot/bull's-eye/ (2)failure mark (sumo)/(P) leda1
冬空 fuyuzora zimní oblohaleda1, shizen, tenki
素数 sosuu prime numbersmath
信号機 shingouki traffic signaldenki
yume dreamjlpt3, jlpt4