Vocabulary consisting only from characters you are able to read
億
oku
(num) 100,000,000, hundred millionjlpt4
一兆
iččou
1,000,000,000,000, one trillion, one billion (obs. British)mix
百万
hjakuman
(1)1,000,000, one million, million, (2)many mix
一京
ičikjou
deset trilionůmix