Vocabulary consisting only from characters you are able to read
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
十億
じゅうおく
1,000,000,000, billion (American), (obs) milliard (British)mix