| 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 |
Jōyō kanji, taught in grade 1
JLPT level N4
284 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 口 【ク】 mouth, speech, counter for people or implements
- 口径 【コウケイ】 aperture, bore, calibre, caliber
- 開口 【カイコウ】 opening, aperture (e.g. camera), opening one's mouth, beginning to speak, open, broad
- 経口 【ケイコウ】 taken by mouth, oral
- 口 【ク】 mouth, speech, counter for people or implements
- 口 【クチ】 mouth, opening, hole, gap, orifice, mouth (of a bottle), spout, nozzle, mouthpiece, gate, door, entrance, exit, speaking, speech, talk (i.e. gossip), taste, palate, mouth (to feed), opening (i.e. vacancy), available position, invitation, summons, kind, sort, type, opening (i.e. beginning), counter for mouthfuls, shares (of money), stove burners, and swords
- 猪口 【チョコ】 sake cup, small deep porcelain bowl for serving food
- 赤口 【シャッコウ】 day that is unlucky except between the auspicious hours of 11am and 1pm (in the traditional calendar)
Kun reading compounds
- 口 【くち】 mouth, opening, hole, gap, orifice, mouth (of a bottle), spout, nozzle, mouthpiece, gate, door, entrance, exit, speaking, speech, talk (i.e. gossip), taste, palate, mouth (to feed), opening (i.e. vacancy), available position, invitation, summons, kind, sort, type, opening (i.e. beginning), counter for mouthfuls, shares (of money), stove burners, and swords
- 口利き 【くちきき】 mediation, good offices, intervention, mediator, middleman, influential person, person of influence, eloquence, eloquent person, way of speaking
- 切り口 【きりくち】 cut end, section, opening, slit, point of view, (different) perspective, new approach
- 大口 【おおぐち】 big mouth, mouth opened wide, boastful speech, tall talk, bragging, boasting, large amount, large quantity
Readings
- Korean:
- gu
Spanish
- boca
- orificio
- apertura
Portuguese
- boca
French
- bouche
| 27 | A Guide To Reading and Writing Japanese (Florence Sakade) |
| 34 | A Guide To Reading and Writing Japanese 3rd edition (Henshall, Seeley and De Groot) |
| 20 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 213 | A New Dictionary of Kanji Usage |
| 868 | Classic Nelson (Andrew Nelson) |
| 38 | Essential Kanji (P.G. O’Neill) |
| 31 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 29 | Japanese Names (P.G. O’Neill) |
| 2.16 | Japanese for Busy People |
| 54 | Kanji and Kana (Spahn and Hadamitzky) |
| 54 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 167 | Kanji in Context (Nishiguchi and Kono) |
| 276 | Kodansha Compact Kanji Guide |
| 4189 | Kodansha Kanji Dictionary (Jack Halpern) |
| 2119 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 2865 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 11 | Les Kanjis dans la tete (Yves Maniette) |
| 3227 | Morohashi |
| 3382 | New Japanese English Character Dictionary (Jack Halpern) |
| 685 | New Nelson (John Haig) |
| 11 | Remembering The Kanji (James Heisig) |
| 11 | Remembering The Kanji, 6th edition (James Heisig) |
| 200 | The Kanji Way to Japanese Language Power (Dale Crowley) |
| 16 | Tuttle Kanji Cards (Alexander Kask) |
| 3777 | 2001 Kanji |
| 3d0.1 | The Kanji Dictionary |
| 4-3-1 | SKIP code |
| 3-3-0 | SKIP code |
| 6000.0 | Four corner code |
| 1-24-93 | JIS X 0208-1997 kuten code |
| 53e3 | Unicode hex code |
Jōyō kanji, taught in grade 3
JLPT level N2
140 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 県 【ケン】 prefecture (of Japan), county (of China, Taiwan, Norway, etc.), department (of France), province (of Italy, Spain, etc.)
- 県営 【ケンエイ】 (under) prefectural management
- 都道府県 【トドウフケン】 prefectures (of Japan), largest administrative divisions of Japan: Tokyo-to, Osaka-fu, Kyoto-fu, Hokkaido and the remaining prefectures
- 同県 【ドウケン】 the same prefecture, the said prefecture
Readings
- Japanese names:
- あがた、 がた
- Korean:
- hyeon
Spanish
- prefectura
Portuguese
- Condado
- prefeitura (região)
French
- préfecture
- département
| 203 | A Guide To Reading and Writing Japanese (Florence Sakade) |
| 291 | A Guide To Reading and Writing Japanese 3rd edition (Henshall, Seeley and De Groot) |
| 273 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 195 | A New Dictionary of Kanji Usage |
| 1362 | Classic Nelson (Andrew Nelson) |
| 381 | Essential Kanji (P.G. O’Neill) |
| 226 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 1252 | Japanese Names (P.G. O’Neill) |
| 194 | Kanji and Kana (Spahn and Hadamitzky) |
| 194 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 336 | Kanji in Context (Nishiguchi and Kono) |
| 1380 | Kodansha Compact Kanji Guide |
| 3269 | Kodansha Kanji Dictionary (Jack Halpern) |
| 1687 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 2294 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 126 | Les Kanjis dans la tete (Yves Maniette) |
| 23210P | Morohashi |
| 2641 | New Japanese English Character Dictionary (Jack Halpern) |
| 3918 | New Nelson (John Haig) |
| 513 | Remembering The Kanji (James Heisig) |
| 552 | Remembering The Kanji, 6th edition (James Heisig) |
| 326 | Tuttle Kanji Cards (Alexander Kask) |
| 1241 | 2001 Kanji |
| 3n6.3 | The Kanji Dictionary |
| 2-6-3 | SKIP code |
| 3-4-5 | SKIP code |
| 2-5-4 | SKIP code |
| 2690.1 | Four corner code |
| 1-24-09 | JIS X 0208-1997 kuten code |
| 770c | Unicode hex code |