Vocabulary consisting only from characters you are able to read
山川
さんせん; やまかわ; やまがわ
mountains and rivers; mountains and rivers; mountain riversmix
水力
すいりょく
hydraulic power, water powermix
赤字
あかじ
(1)deficit, (being in or going into) the red, (2)red text, red letters, (3)corrections (by a teacher or proofreader) written in red mix