こ
| 後 | ご | afterwards, since then, in the future | 2071 666-2 |
| 後者 | こうしゃ | the latter, the second of two | |
| 語 | ご | language, word | 2118 682-2 |
| 語学 | ごがく | language study | |
| 恋 | こい | love, tender passion | 2352 |
| 恋人 | こいびと | lover, sweetheart | |
| 濃い | こい | thick (as of color, liquid), dense, strong | 2353 |
| 幸運 | こううん | good luck, fortune | 828 |
| 講演 | こうえん | lecture, address | 1296 |
| 講義 | こうぎ | lecture | |
| 効果 | こうか | effect, effectiveness, efficacy, result | 1172 |
| 硬貨 | こうか | coin | 2314 |
| 高価 | こうか | high price | 646-2 |
| 高速 | こうそく | high speed, high gear | |
| 豪華 | ごうか | wonderful, gorgeous, splendor, pomp, extravagance | 2354 |
| 合格 | ごうかく | success, passing (e.g. exam), eligibility | 698 |
| 合計 | ごうけい | sum total, total amount | |
| 交換 | こうかん | exchange, interchange, reciprocity | 642 |
| 交際 | こうさい | company, friendship, association, society, acquaintance | |
| 航空 | こうくう | aviation, flying | 1112 |
| 光景 | こうけい | scene, spectacle | 642-2 |
| 攻撃 | こうげき | attack, strike, offensive, criticism, censure | 2355 |
| 貢献 | こうけん | contribution, services | 2356 |
| 貢租 | こうそ | annual tax, tribute | |
| 広告 | こうこく | advertisement | 640 |
| 工場 | こうば | factory, plant, mill, workshop | 685-4 |
| 構成 | こうせい | organization, composition | 1235 |
| 構想 | こうそう | idea, plot, plan | |
| 行動 | こうどう | action, conduct, behavior, mobilization | 692-4 |
| 強盗 | ごうとう | robbery, burglary | 646 |
| 強情 | ごうじょう | stubbornness | |
| 幸福 | こうふく | happiness, blessedness | 828 |
| 公平 | こうへい | fairness, impartial, justice | 669-2 |
| 候補 | こうほ | candidacy | 975 |
| 考慮 | こうりょ | consideration, taking into account | 687-2 |
| 越える | こえる | to exceed, to cross over, to cross | 2357 |
| コーチ | coach | ||
| コード | code, cord, chord | ||
| 氷 | こおり | ice, hail | 869 |
| 凍る | こおる | to freeze, to be frozen over, to congeal | |
| ゴール | goal | ||
| 誤解 | ごかい | misunderstanding | 1487 |
| 誤植 | ごしょく | misprint | |
| 呼吸 | こきゅう | breath, respiration | 1355 |
| 故郷 | こきょう | home town, birthplace, old village, historic village | 1224 |
| 故障 | こしょう | break-down, failure, accident, out of order | |
| 極 | ごく | quite, very | 1065 |
| 極上 | ごくじょう | first-rate | |
| 国語 | こくご | national language | 669 |
| 国民 | こくみん | national, people, citizen | |
| 国家 | こっか | state, country, nation | |
| 国会 | こっかい | National Diet, parliament, congress | |
| 国境 | こっきょう | national or state border | |
| 黒板 | こくばん | blackboard | 859 |
| 克服 | こくふく | subjugation, conquest | 2358 s1206 |
| 克明 | こくめい | detailed, elaborate | |
| 穀物 | こくもつ | grain, cereal, corn | 1443 |
| 穀粒 | こくりゅう | kernel, grain | |
| 此処 | ここ | here | 2359 |
| 腰 | こし | hip | 2360 |
| 個人 | こじん | individual, private person, personal, private | 1978 1163 |
| 越す | こす | to go over (e.g. with audience) | 2357 |
| 骨折 | こっせつ | bone fracture | 1507 |
| 事 | こと | thing, matter, fact, circumstances | 781 |
| 異なる | ことなる | to differ, to vary, to disagree | 1433 |
| 断る | ことわる | to refuse, to decline, to dismiss | 1226 |
| 諺 | ことわざ | proverb, maxim | 2361 |
| 粉 | こな | flour, meal, powder | 1101 |
| この | this | ||
| 好み | このみ | liking, taste, choice | 1020 |
| 好む | このむ | to like, to prefer | |
| コピー | (1) a (photo)copy, (2) blurb on a book jacket | ||
| 塵 | ごみ | dust, dirt | 2362 |
| 塵箱 | ごみばこ | garbage box | |
| 小包 | こづつみ | parcel, package | 2078 748-2 |
| 小麦 | こむぎ | wheat | |
| 小屋 | こや | hut, cabin, shed, (animal) pen | |
| 御免なさい | ごめんなさい | I beg your pardon, excuse me | |
| 此れ等 | これら | these | 2359 |
| 頃 | ころ | time, about, toward, approximately (time) | 2363 |
| 殺す | ころす | to kill | 1071 |
| 転ぶ | ころぶ | to fall down, to fall over | 935 |
| 今日 | こんにち | today, this day | 660-2 |
| 今回 | こんかい | now, this time, lately | |
| 今後 | こんご | from now on, hereafter | |
| 混雑 | こんざつ | confusion, congestion | 1240 |
| 混交 | こんこう | intermixture, mixture | |
| 混乱 | こんらん | disorder, chaos, confusion, mayhem | |
| こんなに | so, like this, in this way | ||
| 困難 | こんなん | difficulty, distress | 1357 |
| 今日は | こんにちは | hello, good day (daytime greeting, id) | 660-2 |
| コンピューター | computer | ||
| 婚約 | こんやく | engagement, betrothal | 798 2364 |
| 婚礼 | こんれい | marriage ceremony; wedding | 2364 |