Vocabulary consisting only from characters you are able to read

kanji kana meaning randomReload
足りない tarinai (1)insufficient/not enough/lacking/ (2)dim-witted/slow/one brick short of a full load adj
kusa grassjlpt4, leda1, shokubutsu
人工 jinkou artificial, manmade, human work, human skill, artificialitymix
赤字 akaji (1)deficit, (being in or going into) the red, (2)red text, red letters, (3)corrections (by a teacher or proofreader) written in red mix
kuchi mouth, orifice, openinghito, jlpt5