Vocabulary consisting only from characters you are able to read

kanji kana meaning randomReload
開通 kaitsuu opening, open, taking effect, becoming activesuru
医学 igaku medical sciencejlpt4
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
組み合わせ kumiawase combinationmix
山海 sankai mountains and seasshizen