[こくご, kokugo] (n) (1) national language; (2) (See 国語科) Japanese language (often as a school subject); (3) native Japanese words (as opposed to loanwords); (P)#5373
[よみほん, yomihon] (n) (1) (See 入門書) reading-book; reader; guidebook; manual; (2) (original meaning) textbook (esp. a pre-war elementary school Japanese language textbook); (P)#6978