Vocabulary consisting only from characters you are able to read
山
やま
mountain, pile, heap, climax, critical pointjlpt5, shizen
中
なか
inside, middle, amongjlpt5
肉声
にくせい
natural voice (without a microphone)/(P)leda1
黒字
くろじ
balance (figure) in the black
急に
きゅうに
(1)swiftly, rapidly, (2)suddenly, abruptly, immediately jlpt3, mix