Vocabulary consisting only from characters you are able to read
主な
omona
chief, main, principal, importantmix
億
oku
(num) 100,000,000, hundred millionjlpt4
五日
icuka
five days, the fifth day (of the month)jlpt5, toki
人
hito
man, person, human being, mankindhito, jlpt5
十億
džuuoku
1,000,000,000, billion (American), (obs) milliard (British)mix
九日
kokonoka
nine days, the ninth day (of the month)jlpt5, toki