| 534 | A Guide To Reading and Writing Japanese (Florence Sakade) |
| 632 | A Guide To Reading and Writing Japanese 3rd edition (Henshall, Seeley and De Groot) |
| 602 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 680 | A New Dictionary of Kanji Usage |
| 5138 | Classic Nelson (Andrew Nelson) |
| 493 | Essential Kanji (P.G. O’Neill) |
| 1012 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 2755 | Japanese Names (P.G. O’Neill) |
| 3.16 | Japanese for Busy People |
| 226 | Kanji and Kana (Spahn and Hadamitzky) |
| 226 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 563 | Kanji in Context (Nishiguchi and Kono) |
| 1896 | Kodansha Compact Kanji Guide |
| 2275 | Kodansha Kanji Dictionary (Jack Halpern) |
| 1176 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 1606 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 940 | Les Kanjis dans la tete (Yves Maniette) |
| 43608P | Morohashi |
| 1807 | New Japanese English Character Dictionary (Jack Halpern) |
| 6647 | New Nelson (John Haig) |
| 931 | Remembering The Kanji (James Heisig) |
| 1000 | Remembering The Kanji, 6th edition (James Heisig) |
| 480 | The Kanji Way to Japanese Language Power (Dale Crowley) |
| 636 | Tuttle Kanji Cards (Alexander Kask) |
Jōyō kanji, taught in grade 4
JLPT level N3
678 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 類 【ルイ】 kind, sort, type, class, genus, order, family, similar example, parallel, the like
- 類似 【ルイジ】 resemblance, similarity, likeness, analogy
- 魚類 【ギョルイ】 fish, fishes
- 魚介類 【ギョカイルイ】 marine products, seafood, fish and shellfish
Kun reading compounds
- 類い 【たぐい】 kind, sort, type, equal, match, peer
- 類いする 【たぐいする】 to be equal to, to be as good as, to be a match for, to rival
Readings
- Korean:
- ryu
Spanish
- variedad
- clase
- parecido
- afectar
Portuguese
- espécie
- tipo
- variedade
- classe
- gênero
French
- sorte
- variété
- classe
- genre
| 1061 | 2001 Kanji |
| 9a9.1 | The Kanji Dictionary |
| 1-9-9 | SKIP code |
| 9148.6 | Four corner code |
| 1-46-64 | JIS X 0208-1997 kuten code |
| 985e | Unicode hex code |
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
| 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) |
| 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 |