Vocabulary consisting only from characters you are able to read
器官
kikan
organ (of body), instrumentmix
苦笑
kushou
bitter smile, wry smile, strained laugh, sarcastic laughsuru
歯石
shiseki
dental calculus (calcified deposits that accumulate on the teeth), tartar (of the teeth)mix
変数
hensuu
variable (e.g. math), parametermix
命令形
meireikei
(ling) imperative form, commandbunpou
速やか
sumiyaka
speedy, prompt, smoothmix