| Meaning | Explication | As a source | As a target | Taxon | ||
|---|---|---|---|---|---|---|
| <office> | organization or its division | 1 | Show all shifts | Show map | ||
| <orthopteran> | any of many insects of the order Orthoptera | 2 | 2 | Show all shifts | Show map | |
| oak | deciduous tree with distinctive deeply lobed leaves, acorns, and notably strong wood, typically of England and northeastern North America, included in genus Quercus. | 4 | 6 | Show all shifts | Show map | |
| oar | type of lever used to propel a boat, having a flat blade at one end and a handle at the other, and pivoted in a rowlock atop the gunwale, whereby a rower seated in the boat and pulling the handle can pass the blade through the water by repeated strokes against the water's resistance, thus moving the boat | 2 | 5 | Show all shifts | Show map | |
| oat | widely cultivated cereal grass, typically Avena sativa | 3 | 2 | Show all shifts | Show map | |
| oath | solemn pledge or promise that invokes a deity, a ruler, or another entity (not necessarily present) to attest the truth of a statement or sincerity of one's desire to fulfill a contract or promise | 1 | Show all shifts | Show map | ||
| obedient | willing to comply with the commands, orders, or instructions of those in authority | 1 | Show all shifts | Show map | ||
| object | None | 1 | Show all shifts | Show map | ||
| objection, contradiction | 1 | Show all shifts | Show map | |||
| obscene | inappropriate, contrary to the rules of decency, offensive to standards of decency or morality | 3 | Show all shifts | Show map | ||
| observer | 1 | Show all shifts | Show map | |||
| obsidian | naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth | 1 | Show all shifts | Show map | ||
| obstacle | something that impedes progress or achievement (Merriam-Webster) | 4 | Show all shifts | Show map | ||
| obstinate, persistent | None | 1 | 7 | Show all shifts | Show map | |
| ocean | one of the large bodies of water separating the continents | 2 | Show all shifts | Show map | ||
| ocean sunfish (Mola mola) | large, heavy species of bony fish, Mola mola, native to tropical and temperate waters around the world | 8 | Show all shifts | Show map | ||
| ochre | 1 | Show all shifts | Show map | |||
| October | tenth month of the Gregorian calendar, following September and preceding November | 22 | Show all shifts | Show map | ||
| odd (of numbers) | not divisible by two without leaving a remainder | 1 | 1 | Show all shifts | Show map | |
| oesophagus | tube that carries food from the pharynx to the stomach | 1 | Show all shifts | Show map | ||
| of high degree (about pain) | None | 2 | Show all shifts | Show map | ||
| of high rank | 2 | Show all shifts | Show map | |||
| of low rank | None | 1 | Show all shifts | Show map | ||
| offer, proposal | something which is proposed, or offered for consideration or acceptance | 1 | Show all shifts | Show map | ||
| official (n.) | 1 | Show all shifts | Show map | |||
| offspring | 1 | 2 | Show all shifts | Show map | ||
| often | 1 | Show all shifts | Show map | |||
| oil (food) | 11 | 1 | Show all shifts | Show map | ||
| oil slick | droplet of oil on the surface of the broth | 1 | Show all shifts | Show map | ||
| ointment | (medicine) A viscous preparation of oils and/or fats, usually containing medication, used as a treatment or as an emollient | 1 | Show all shifts | Show map | ||
| OK | expression used to indicate acceptance | 2 | Show all shifts | Show map | ||
| old (vs. new) | existing, created a long time ago | 3 | 3 | Show all shifts | Show map | |
| old (vs. young) | having lived for most of the expected years | 8 | 3 | Show all shifts | Show map | |
| old man | 12 | 3 | Show all shifts | Show map | ||
| old man/grandfather | old man and grandfather | 1 | Show all shifts | Show map | ||
| old woman | 3 | 2 | Show all shifts | Show map | ||
| oleander | 1 | Show all shifts | Show map | |||
| olive (Olea europaea) | 2 | Show all shifts | Show map | |||
| omasum | the third compartment of the stomach of a ruminant | 3 | Show all shifts | Show map | ||
| omen | 1 | 2 | Show all shifts | Show map | ||
| on the outside | 1 | 2 | Show all shifts | Show map | ||
| once | 1 | Show all shifts | Show map | |||
| one hundred thousand | 1 | Show all shifts | Show map | |||
| one's own | 2 | Show all shifts | Show map | |||
| one, single | None | 9 | Show all shifts | Show map | ||
| onion | 3 | 2 | Show all shifts | Show map | ||
| only | None | 1 | 6 | Show all shifts | Show map | |
| open (adj.) | 4 | 1 | Show all shifts | Show map | ||
| open-eyed | with open eyes | 1 | Show all shifts | Show map | ||
| opening of a sack | 1 | Show all shifts | Show map | |||
| opening, hole | 11 | 7 | Show all shifts | Show map | ||
| operculum of a snail | anatomical structure like a trapdoor that exists in many (but not all) groups of sea snails and freshwater snails, and also in a few groups of land snails | 1 | Show all shifts | Show map | ||
| Ophiuchus (Constellation) | zodiacal constellation of the northern summer said to depict a man holding a serpent | 1 | Show all shifts | Show map | ||
| opilione, daddy longlegs | any species of non-venomous arachnids with often very long legs (Opiliones) | 1 | Show all shifts | Show map | ||
| opinion | 1 | 1 | Show all shifts | Show map | ||
| opossum | 1 | 1 | Show all shifts | Show map | ||
| opportunity | 5 | Show all shifts | Show map | |||
| opposite (space) | located directly across from something else, or from each other | 4 | 2 | Show all shifts | Show map | |
| orange (color) | colour of a ripe fruit of an orange tree, midway between red and yellow | 1 | Show all shifts | Show map | ||
| orange (plant) | an evergreen tree of the genus Citrus such as Citrus sinensis and fruit of this tree | 2 | 1 | Show all shifts | Show map | |
| orator | 1 | Show all shifts | Show map | |||
| order | 1 | Show all shifts | Show map | |||
| ordinary | 1 | 1 | Show all shifts | Show map | ||
| oregano | herb of the mint family, Origanum vulgare, having aromatic leaves | 3 | Show all shifts | Show map | ||
| organ (anatomy) | larger part of an organism, composed of tissues that perform similar functions | 1 | Show all shifts | Show map | ||
| origin | None | 4 | Show all shifts | Show map | ||
| original (of a document) | None | 1 | Show all shifts | Show map | ||
| Orion's Belt | bright asterism located near the celestial equator, consisting of three bright stars lined up and visibly close together | 1 | Show all shifts | Show map | ||
| orphan | person, especially a minor, both or (rarely) one of whose parents have died | 7 | 1 | Show all shifts | Show map | |
| osprey (Pandion haliaёtus) | bird of prey of genus Pandion that feeds on fish and has white underparts and long, narrow wings each ending in four finger-like extensions | 7 | Show all shifts | Show map | ||
| ostrich | large flightless bird of the order Struthioniformes | 2 | Show all shifts | Show map | ||
| other | 9 | 1 | Show all shifts | Show map | ||
| other`s | 2 | Show all shifts | Show map | |||
| otter (Lutra lutra) | aquatic or marine carnivorous mammal in the subfamily Lutrinae | 4 | 7 | Show all shifts | Show map | |
| outbuilding | 1 | Show all shifts | Show map | |||
| outcast | one that has been excluded from a society or system, a pariah | 1 | Show all shifts | Show map | ||
| outwards | Show all shifts | Show map | ||||
| ovary | one of the typically paired essential female reproductive organs that produce eggs and in vertebrates female sex hormones | 1 | Show all shifts | Show map | ||
| oven | 1 | Show all shifts | Show map | |||
| overcoat | 2 | Show all shifts | Show map | |||
| owl | any of various birds of prey of the order Strigiformes, families Strigidae and Tytonidae, that are primarily nocturnal and have forward-looking, binocular vision, limited eye movement, and good hearing | 4 | 1 | Show all shifts | Show map | |
| owner | 10 | 3 | Show all shifts | Show map | ||
| owner (female) | 3 | Show all shifts | Show map | |||
| owre, buffalo (Bubalus bubalis) | 1 | Show all shifts | Show map | |||
| ox | adult castrated male of cattle (B. taurus), especially when used as a beast of burden | Show all shifts | Show map |