Vocabulary consisting only from characters you are able to read
億
oku
(num) 100,000,000, hundred millionjlpt4
土木
doboku
public worksmix
十億
džuuoku
1,000,000,000, billion (American), (obs) milliard (British)mix
鼠
nezumi
(1)mouse, rat, (2)dark gray, dark grey, slate (color, colour); (3)mouse, rat, (4)dark gray, dark grey, slate (color, colour) doubutsu
2と3分の2
nitosanbunnoni
2 2/3 (two and two thirds)math