Vocabulary consisting only from characters you are able to read
夜中
よなか
during the night, at night; (arch) all night, the whole night; midnight, dead of nightmix
活用
かつよう
(1)practical use, application, (2)(ling) conjugation, declension, inflection suru
Já jsem se učil asi 5 hodin, ale nemyslím, že to stačí.gakkou