Vocabulary consisting only from characters you are able to read
億
おく
(num) 100,000,000, hundred millionjlpt4
鼠
ねずみ
(1)mouse, rat, (2)dark gray, dark grey, slate (color, colour); (3)mouse, rat, (4)dark gray, dark grey, slate (color, colour) doubutsu
小ちゃい
ちいちゃい
small (babytalk form)adj