Vocabulary consisting only from characters you are able to read
喜び
よろこび
joy/delight/rapture/pleasure/gratification/rejoicing/congratulations/felicitations/(P)jlpt3
億
おく
(num) 100,000,000, hundred millionjlpt4
十億
じゅうおく
1,000,000,000, billion (American), (obs) milliard (British)mix