Vocabulary consisting only from characters you are able to read
億
oku
(num) 100,000,000, hundred millionjlpt4
百京
hjakukjou
kvadrilionmix
十億
džuuoku
1,000,000,000, billion (American), (obs) milliard (British)mix
百万
hjakuman
(1)1,000,000, one million, million, (2)many mix