Vocabulary consisting only from characters you are able to read
億
おく
(num) 100,000,000, hundred millionjlpt4
種
しゅ
(1)kind, variety, (2)(biological) species, (3)(abbr) (logical) species mix
戦
いくさ
(1)war, battle, campaign, fight, (2)(arch) troops, forces; (3)war, battle, (4)match, competition mix