Vocabulary consisting only from characters you are able to read
中
なか
inside, middle, amongjlpt5
気力
きりょく
willpower, energy, vitalitymix
火力
かりょく
heating power, steam powermix
私
わたくし
I (formal), myself, private affairsjlpt5
七日
なのか
seven days, the seventh day of the monthjlpt5, toki
国字
こくじ
(1)country's official writing system, native script, (2)kana, (3)kanji that originated in Japan (as opposed to China) bunpou