| Word | Reading | Meaning | Level |
|---|
| 秘密 | ひみつ | secret | N5 |
| 密集 | みっしゅう | crowding, density | N3 |
| 密閉 | みっぺい | airtight sealing | N3 |
| 密着 | みっちゃく | close adhesion, tight fit | N3 |
| 精密 | せいみつ | precise, precision | N3 |
| 密会 | みっかい | clandestine meeting, secret rendezvous | N3 |
| 密談 | みつだん | private conference | N3 |
| 密約 | みつやく | secret pact, clandestine deal | N3 |
| 密告 | みっこく | anonymous tip, secret leak | N3 |
| 厳密 | げんみつ | strict, precise | N3 |
| 緻密 | ちみつ | fine, meticulous | N3 |
| 密輸 | みつゆ | smuggling | N3 |
| 密室 | みっしつ | closed room | N3 |
| 密かに | ひそかに | secretly | N2 |
| 秘密録音 | ひみつろくおん | secret recording | N2 |
| 過密 | かみつ | overcrowded | N2 |
| 緊密 | きんみつ | close, rigorous coordination | N1 |
| 精密化 | せいみつか | refinement, sharpening | N1 |
| 秘密保持 | ひみつほじ | confidentiality, secrecy | N1 |
| 密封 | みっぷう | airtight container sealing | N1 |
| 厳密管理 | げんみつかんり | rigorous procedural stewardship | N1 |
