flint (stone) / grindstone / whetstone / anvil / model or standard (of excellence)

分かる, 解る: (...が...に~) to understand, to be understandable / 分かる: to tell (one thing from another), to distinguish / 分かる, 判る: to recognize, to realize / 分かる: to become known, to turn out

電気力学: electrodynamics

alive / lively / (of a machine or device) on; active; in operation

Synonym of セントクリストファー・ネイビス (Sento Kurisutofā Neibisu, “Saint Christopher and Nevis”): Saint Kitts and Nevis (a country consisting of two islands in the Caribbean)

record (most extreme known value of some achievement), such as in sports / recording

record

(dated) Synonym of キルギス (Kirigisu, “Kyrgyzstan”); Kirghizia

a kipper: a dried and smoked herring or salmon

a kippa: a skullcap worn by religious Jewish males