Vocabulary consisting only from characters you are able to read

kanji kana meaning randomReload
発電所 はつでんしょ power plant, power stationmix
閉集合 へいしゅうごう closed setmath
消失 しょうしつ die out, disappear, vanish; die out, disappear, vanishsuru
そら skyjlpt5, leda1, shizen
文部省 もんぶしょう (abbr) Ministry of Education, Culture, Sports, Science and Technologymix