| 精錬 | せいれん | refining, smelting, tempering |
| 錬金術 | れんきんじゅつ | alchemy; making big money (implied, by dubious means) |
| 鍛錬 | たんれん | tempering, forging, hardening, disciplining, training |
| 百戦錬磨 | ひゃくせんれんま | veteran, (someone) schooled by adversity in many battles, (someone) rich in life's experience gained through much adversity |
| 試錬 | しれん | test, trial, probation, ordeal, tribulation |
| 精錬所 | せいれんしょ, せいれんじょ | refinery, smelting works |
| 洗錬 | せんれん | polish, refinement |
| 百錬 | ひゃくれん | well-tempered, well drilled, well trained |
| 錬成 | れんせい | training, drilling |
| 修錬 | しゅうれん | culture, training, drill, practice, practise |
