欣也: a male given name / 勤也: a male given name

(disaster prevention) Short for 木造住宅密集地域 (mokuzō jūtaku misshū chiiki, “densely built wooden house area”).

equality, uniformity

proximal pronoun

equal, uniform

contraband, prohibited goods

a narrow margin (of victory etc.)

very important

betel pepper

this may be "nie" (錵, martensitic crystals embedded in pearlite matrix), from wikipedia article https://en.wikipedia.org/wiki/Masamune#Style ,referring to quenching hot steel.