| あっての | [, atteno] (adj-f) which can exist solely due to the presence of; whose existence is determined entirely by; which owes everything to; (P) |
| アマシイラ属 | [アマシイラぞく, amashiira zoku] (n) Luvarus (sole genus of perciform fish in the family Luvaridae whose only member is the luvar) |
| イコクエイラクブカ属 | [イコクエイラクブカぞく, ikokueirakubuka zoku] (n) Galeorhinus (genus whose only member is the school shark, Galeorhinus galeus, in the family Triakidae) |
| イタチザメ属 | [イタチザメぞく, itachizame zoku] (n) Galeocerdo (genus in the family Carcharhinidae whose sole member is the tiger shark) |
| インドシュモクザメ属 | [インドシュモクザメぞく, indoshumokuzame zoku] (n) Eusphyra (genus of hammerhead shark in the family Sphyrnidae whose sole member is the winghead shark) |
| ウバザメ科 | [ウバザメか, ubazame ka] (n) Cetorhinidae (family whose only member is the basking shark) |
| エビスザメ属 | [エビスザメぞく, ebisuzame zoku] (n) Notorynchus (genus of cow sharks in the family Hexanchidae whose only extant member is the broadnose sevengill shark) |
| オオトカゲ科 | [オオトカゲか, ootokage ka] (n) Varanidae (family of carnivorous monitor lizards whose only living genus is Varanus) |
| オハグロハギ | [, ohagurohagi] (n) Thompson's surgeonfish (Acanthurus thompsoni, species of Indo-Pacific tang whose Indian Ocean population lacks the white caudal fin of the Pacific variety) |
| チヒロザメ属 | [チヒロザメぞく, chihirozame zoku] (n) Pseudotriakis (genus of ground shark in the family Pseudotriakidae whose sole member is the false catshark) |
| トガリザメ属 | [トガリザメぞく, togarizame zoku] (n) Nasolamia (genus of requiem shark in the family Carcharhinidae whose only member is the whitenose shark) |
| ナンヨウハギ属 | [ナンヨウハギぞく, nanyouhagi zoku] (n) Paracanthurus (genus in the family Acanthuridae whose sole member is the palette surgeonfish) |
| ネイリスト | [, neirisuto] (n) nailist; someone whose occupation is to cut any type of nail, apply artificial nails (or "nail art") and care for nails |
| ビンバー | [, binba-] (n) (1) (See ビンベスト,貧乏) someone whose state is slightly poorer than regular poverty; (2) 2nd degree poverty |
| フリーター | [, furi-ta-] (n) (abbr) (from freelance and arbeiter) young people subsisting on part-time work; one whose livelihood is provided by part-time work; (P) |
| ミズワニ科 | [ミズワニか, mizuwani ka] (n) Pseudocarchariidae (family whose only member is a species of mackerel shark known as the crocodile shark) |
| メガマウス科 | [メガマウスか, megamausu ka] (n) Megachasmidae (family whose sole member is the rare deep water megamouth shark) |
| ラブカ科 | [ラブカか, rabuka ka] (n) Chlamydoselachidae (family of frilled sharks whose sole extant genus is Chlamydoselachus) |
| 伏竜鳳雛 | [ふくりょうほうすう, fukuryouhousuu] (n) gifted young person who shows much promise; unrecognized genius; great person whose talent is hidden under a bushel |
| 余計者 | [よけいもの, yokeimono] (n) person whose presence is unwelcome, unnecessary or a nuisance; fifth wheel; third wheel; interloper |
| 側生動物 | [そくせいどうぶつ, sokuseidoubutsu] (n) parazoan (member of an ancestral subkingdom of animals whose only surviving members are the sponges) |
| 偶関数 | [ぐうかんすう, guukansuu] (n) {math} even function; function whose graph has symmetry about the y-axis |
| 八分 | [はっぷん, happun] (n-t) (1) eight minutes; (n) (2) (See 六体) triangular-swept clerical script (clerical script whose horizontal lines end in a noticable triangular tail) |
| 勅祭社 | [ちょくさいしゃ, chokusaisha] (n) shrine whose rituals are attended by an imperial envoy (who presents offerings) |
| 単複同形 | [たんぷくどうけい, tanpukudoukei] (n) nouns whose plural has the same form as their singular (e.g. sheep) |
| 女系天皇 | [じょけいてんのう, jokeitennou] (n) (See 女性天皇) matrilineal emperor of Japan; emperor (either male or female) whose mother is (was) a member of the Imperial family but whose father is (was) not |
| 御先棒;お先棒 | [おさきぼう, osakibou] (n) a person whose services are at the disposal of another |
| 権兵衛 | [ごんべえ, gonbee] (n) (1) (arch) (derog) country bumpkin; (2) John Doe; used to refer to someone whose name is unknown |
| 水かけ論;水掛け論;水掛論 | [みずかけろん, mizukakeron] (n) endless argument; pointless argument; arguing over whose field to water (e.g. during a drought) |
| 穢多(ateji) | [えた, eta] (n) (vulg) (See 被差別部落民) one group comprising the lowest rank of Japan's Edo-period caste system (people whose work usually involved handling human bodies or animal carcasses) |
| 臥竜鳳雛 | [がりょうほうすう, garyouhousuu] (n) gifted young person who shows much promise; unrecognized genius; great person whose talent is hidden under a bushel |
| 認証官 | [にんしょうかん, ninshoukan] (n) official whose appointment and dismissal requires Imperial acknowledgement (acknowledgment) |
| 足長おじさん | [あしながおじさん, ashinagaojisan] (n) (1) (See 大蚊) anonymous scholarship system for orphans whose parents have been killed in traffic accidents (from Daddy-Long-Legs, a 1912 novel by Jean Webster); (2) harvestman; daddy longlegs (arachnid of order Opiliones) |
| 集合犯 | [しゅうごうはん, shuugouhan] (n) (1) single crime that naturally consists of a number of incidences and is charged as only one count (i.e. habitual gambling); (2) (See 集団犯罪) crime whose goal requires a large number of people acting together (i.e. insurrection) |
| 集団犯 | [しゅうだんはん, shuudanhan] (n) crime whose goal requires a large number of people acting together (i.e. insurrection) |
| 雨女 | [あめおんな, ameonna] (n) woman whose presence seems to cause rain |