Vocabulary consisting only from characters you are able to read

kanji kana meaning randomReload
人口 じんこう populationjlpt4, leda1
山々 やまやま mountainsshizen
術語 じゅつご technical term, terminology, nomenclaturemix
使える つかえる to be useful/to be serviceableichidan, leda1, verb
水母 くらげ jellyfishdoubutsu