Vocabulary consisting only from characters you are able to read

kanji kana meaning randomReload
人口 džinkou populationjlpt4, leda1
下る kudaru (1)to descend, to go down, to come down, (2)to be handed down (of an order, judgment, etc.), (3)to pass (of time), (4)to surrender, to capitulate, (5)(often in neg. form) to be less than, to be i godan, jlpt3, verb, vintrans
火力 karjoku heating power, steam powermix
通る tooru to pass, to go alongjlpt3, jlpt4, verb, vintrans
mizu waterjlpt5, kagaku, ryouri, shizen