| 1661 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 1756 | A New Dictionary of Kanji Usage |
| 2546 | Classic Nelson (Andrew Nelson) |
| 1468 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 821 | Japanese Names (P.G. O’Neill) |
| 1301 | Kanji and Kana (Spahn and Hadamitzky) |
| 1380 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 1844 | Kanji in Context (Nishiguchi and Kono) |
| 1191 | Kodansha Compact Kanji Guide |
| 455 | Kodansha Kanji Dictionary (Jack Halpern) |
| 280 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 340 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 183 | Les Kanjis dans la tete (Yves Maniette) |
| 17386 | Morohashi |
| 380 | New Japanese English Character Dictionary (Jack Halpern) |
| 3125 | New Nelson (John Haig) |
| 181 | Remembering The Kanji (James Heisig) |
| 193 | Remembering The Kanji, 6th edition (James Heisig) |
| 1276 | Tuttle Kanji Cards (Alexander Kask) |
Jōyō kanji, taught in junior high
JLPT level N1
1618 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 洞 【ドウ】 sinus, cavity, antrum, neighborhood (administrative division in North Korea)
- 洞察 【ドウサツ】 discernment, insight
- 空洞 【クウドウ】 cavity, hollow, cave, cavern, hollow
- 風洞 【フウドウ】 wind tunnel
Kun reading compounds
- 洞 【ほら】 hollow, cavity, hole, cave
- 洞穴 【ほらあな】 cave, cavern, den, grotto
Readings
- Japanese names:
- とう
- Korean:
- dong, tong
Spanish
- cavidad
- hueco
- excavación
- prever
Portuguese
- gruta
- caverna
- escavação
French
- antre
- grotte
- excavation
| 349 | 2001 Kanji |
| 3a6.25 | The Kanji Dictionary |
| 1-3-6 | SKIP code |
| 3712.0 | Four corner code |
| 1-38-22 | JIS X 0208-1997 kuten code |
| 6d1e | Unicode hex code |
Stroke order
On reading compounds
- 好々爺 【コウコウヤ】 good-natured old man
- 老爺 【ロウヤ】 old man
Kun reading compounds
- 爺 【じじ】 old man, old geezer
- 爺さん 【じいさん】 grandfather, male senior-citizen
- 子泣き爺 【こなきじじい】 Konaki Jijii (a ghost in Japanese folklore with the shape of a small old man and having a baby's cry)
- 狸爺 【たぬきじじい】 cunning old man
- 爺 【じじ】 old man, old geezer
- 子泣き爺 【こなきじじい】 Konaki Jijii (a ghost in Japanese folklore with the shape of a small old man and having a baby's cry)
- 狸爺 【たぬきじじい】 cunning old man
- 爺 【じじ】 old man, old geezer
- ジジ臭い 【ジジくさい】 old-mannish
Readings
- Korean:
- ya
Spanish
- anciano
- viejo
- abuelo
Portuguese
French
| 2835 | Classic Nelson (Andrew Nelson) |
| 2656 | Kodansha Kanji Dictionary (Jack Halpern) |
| 19734 | Morohashi |
| 3517 | New Nelson (John Haig) |
| 2334 | Remembering The Kanji (James Heisig) |
| 2423 | Remembering The Kanji, 6th edition (James Heisig) |
| 2o10.6 | The Kanji Dictionary |
| 2-4-9 | SKIP code |
| 8012.7 | Four corner code |
| 1-44-76 | JIS X 0208-1997 kuten code |
| 723a | Unicode hex code |
Jōyō kanji, taught in grade 3
JLPT level N2
1344 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 湖 【コ】 lake (in place names)
- 湖沼 【コショウ】 lake, marsh, wetland, inland waters
- 汽水湖 【キスイコ】 brackish lake
- 塩水湖 【エンスイコ】 saltwater or saline lake
Kun reading compounds
- 湖 【みずうみ】 lake
- 白鳥の湖 【はくちょうのみずうみ】 Swan Lake (ballet)
- 白鳥の湖 【はくちょうのみずうみ】 Swan Lake (ballet)
Readings
- Japanese names:
- うみ、 み
- Korean:
- ho
Spanish
- lago
Portuguese
- lago
French
- lac
| 394 | A Guide To Reading and Writing Japanese (Florence Sakade) |
| 293 | A Guide To Reading and Writing Japanese 3rd edition (Henshall, Seeley and De Groot) |
| 276 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 1086 | A New Dictionary of Kanji Usage |
| 2628 | Classic Nelson (Andrew Nelson) |
| 573 | Essential Kanji (P.G. O’Neill) |
| 699 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 1584 | Japanese Names (P.G. O’Neill) |
| 467 | Kanji and Kana (Spahn and Hadamitzky) |
| 475 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 453 | Kanji in Context (Nishiguchi and Kono) |
| 1220 | Kodansha Compact Kanji Guide |
| 736 | Kodansha Kanji Dictionary (Jack Halpern) |
| 439 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 551 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 150 | Les Kanjis dans la tete (Yves Maniette) |
| 17836 | Morohashi |
| 604 | New Japanese English Character Dictionary (Jack Halpern) |
| 3240 | New Nelson (John Haig) |
| 148 | Remembering The Kanji (James Heisig) |
| 159 | Remembering The Kanji, 6th edition (James Heisig) |
| 396 | Tuttle Kanji Cards (Alexander Kask) |
| 346 | 2001 Kanji |
| 3a9.8 | The Kanji Dictionary |
| 1-3-9 | SKIP code |
| 3712.0 | Four corner code |
| 1-24-48 | JIS X 0208-1997 kuten code |
| 6e56 | Unicode hex code |