Vocabulary consisting only from characters you are able to read
同じく
おなじく
similarly, same (idea), same (name)suru
歯石
しせき
dental calculus (calcified deposits that accumulate on the teeth), tartar (of the teeth)mix
先頭
せんとう
head/lead/vanguard/first/(P)leda1
辞去
じきょ
leaving, quitting, retiringsuru
幸い
さいわい
happiness, blessednessmix
電気屋
でんきや
(1)electric appliance store, (2)(obs) electrician mise
投下
とうか
(1)throwing down, dropping, airdrop, (2)investment suru
使う
つかう
(1)to use (a thing, method, etc.)/to make use of/to put to use/ (2)to use (a person, animal, puppet, etc.)/to employ/to handle/to manage/to manipulate/ (3)to use (time, money, etc.)/to spend/to consu godan, jlpt5, leda1, verb, vtrans