Vocabulary consisting only from characters you are able to read
二人
futari
two persons, two people, pair, couplejlpt5
百京
hjakukjou
kvadrilionmix
十億
džuuoku
1,000,000,000, billion (American), (obs) milliard (British)mix
億
oku
(num) 100,000,000, hundred millionjlpt4
百
hjaku
(num) 100, hundredjlpt5