Vocabulary consisting only from characters you are able to read

kanji kana meaning randomReload
人口 じんこう populationjlpt4, leda1
~中 ~ちゅう in (the middle of), within, during, whilejlpt5
競う きそう (1)to compete with, (2)to emulate godan, verb, vintrans
三才 さんさい tříletýleda1
上がる あがる (1)to rise/to go up/to come up/to ascend/to be raised/ (2)to enter (esp. from outdoors)/to come in/to go in/ (3)to enter (a school)/to advance to the next grade/ (4)to get out (of water)/to come asho godan, verb, vintrans
うえ above, on top of, up, upper part, surfacejlpt5
よじ上る よじのぼる to climb, to clamber (over, up), to scramble (up), to scale, to claw one's way upgodan, verb, vintrans
女の子 おんなのこ girlhito, jlpt5
川下 かわしも downstreamleda1, shizen
下りる おりる to come downichidan, jlpt4, verb, vintrans