- 研究 — research, study
- 研修 — training, instruction
- 研ぐ — to sharpen, to hone
- 研究所 — research institute
- 研磨 — polishing, grinding
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研 combines the radical 石 (stone) with a phonetic element 幵 (ケン) to express the act of sharpening stones — metaphorically extended to studying and refining knowledge.
毎日、研いでいます。
I sharpen it every day.
研究に集中しています。
I'm focusing on my research.