研究【けんきゅう】
study, research, investigation
研究所【けんきゅうじょ】
research establishment, research institute, laboratory
研修【けんしゅう】
training (esp. in-service), induction course
研究室【けんきゅうしつ】
laboratory, seminar room, professor's office
研磨【けんま】
grinding, polishing, refining (a skill, knowledge, etc.), applying oneself (to study), disciplining oneself
研ぐ【とぐ】
to sharpen, to hone, to whet, to grind, to wash (rice), to scour, to polish, to burnish