Vocabulary consisting only from characters you are able to read

kanji kana meaning randomReload
三つ みっつ threejlpt5
くち mouth, orifice, openinghito, jlpt5
人口 じんこう populationjlpt4, leda1
一つ ひとつ onejlpt5
水力 すいりょく hydraulic power, water powermix