Vocabulary consisting only from characters you are able to read
億
oku
(num) 100,000,000, hundred millionjlpt4
兆
čou
(1)sign, omen, indication, portent, (num) (2)10^12, 1,000,000,000,000, trillion (American), (obs) billion (British) mix
百京
hjakukjou
kvadrilionmix
黄金
ougon
gold; (n,adj-no) gold; (n,adj-no) gold; goldmix
列
recu
queue/line/row/column/sequence/string/train/(P)jlpt3, ryokou
主な
omona
chief, main, principal, importantmix