| 1 | 早期 (そうき) |
| (n) early stage |
| 2 | 早計 (そうけい) |
| (adj-na,n) over hasty |
| 3 | 早婚 (そうこん) |
| (n) early marriage |
| 4 | 早産 (そうざん) |
| (n,vs) premature birth |
| 5 | 早成 (そうせい) |
| (n) early completion |
| 6 | 早世 (そうせい) |
| (n,vs) dying young |
| 7 | 早 (そうそう) |
| (adv-to) (1) early |
| 8 | 早々 (そうそう) |
| (adv-to) (1) early |
| 9 | 早退 (そうたい) |
| (n,vs) leave early |
| 10 | 早天 (そうてん) |
| (n) early morning |
| 11 | 早晩 (そうばん) |
| (n-adv,n) sooner or later |
| 12 | 早漏 (そうろう) |
| (n) premature ejaculation |
| 13 | 早老 (そうろう) |
| (n) premature aging |
| 14 | 尚早 (しょうそう) |
| (adj-na,n) prematurity |
| 15 | 早急 (そうきゅう) |
| (adj-na,n) urgent |
| 16 | 早暁 (そうぎょう) |
| (n-adv,n-t) daybreak |
| 17 | 早産児 (そうざんじ) |
| (n) premature baby |
| 18 | 早春 (そうしゅん) |
| (n-adv,n) early spring |
| 19 | 早熟 (そうじゅく) |
| (adj-na,n) precocious |
| 20 | 早生児 (そうせいじ) |
| (n) premature baby |
| 21 | 早朝 (そうちょう) |
| (n-adv,n-t) early morning |
| 22 | 早慶戦 (そうけいせん) |
| (n) Waseda-Keio (baseball) game |
| 23 | 早春賦 (そうしゅんふ) |
| (n) Ode to Early Spring |
| 24 | 早東戦 (そうとうせん) |
| (n) (baseball) game between Waseda and Tokyo universities |
| 25 | 早明戦 (そうめいせん) |
| (n) Waseda-Meiji (baseball) game |
| 26 | 時期尚早 (じきしょうそう) |
| (adj-na,n) premature |
| 27 | 時機尚早 (じきしょうそう) |
| (n) before its time |
| 28 | 早期解決 (そうきかいけつ) |
| (n) early (prompt) settlement |
| 29 | 早期診断 (そうきしんだん) |
| (n) early diagnosis |
| 30 | 早期治療 (そうきちりょう) |
| (n) early treatment |
| 31 | 早期発見 (そうきはっけん) |
| (n) early detection (of an illness) |
| 32 | 早教育 (そうきょういく) |
| (n) early education |
| 33 | 早退届け (そうたいとどけ) |
| (n) report of early withdrawal (i.e. when one leaves school or work early) |
| 34 | 早退届 (そうたいとどけ) |
| (n) report of early withdrawal (i.e. when one leaves school or work early) |
| 35 | 早期警戒機 (そうきけいかいき) |
| (n) airborne early-warning system |
| 36 | 早期退職 (そうきたいしょく) |
| (n) early retirement |
| 37 | 早期老化症 (そうきろうかしょう) |
| (n) progeria (disease characterized by symptoms suggestive of premature aging) |
| 38 | 早朝の着 (そうちょうのちゃく) |
| (n) early-morning arrival |
| 39 | できる限り早期 (できるかぎりそうき) |
| (n) as soon as possible |
| 40 | 出来る限り早期 (できるかぎりそうき) |
| (n) as soon as possible |
| 41 | 早食い競争 (はやぐいきょうそう) |
| (n) speed-eating contest |
| 42 | 早期退職制度 (そうきたいしょくせいど) |
| (n) early retirement program |
| 43 | 早発性痴呆症 (そうはつせいちほうしょう) |
| (n) schizophrenia |