| crossbred | (adjective) bred from parents of different varieties or species | - |
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| crossbreed | (noun) (genetics) an organism that is the offspring of genetically dissimilar parents or stock; especially offspring produced by breeding plants or animals of different varieties or breeds or species | Synonyms: cross, hybrid |
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| (verb) breed animals or plants using parents of different races and varieties | Synonyms: cross, hybridise, hybridize, interbreed |
| crossbreeding | (noun) (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids | Synonyms: cross, crossing, hybridisation, hybridization, hybridizing, interbreeding |
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| (noun) reproduction by parents of different races (especially by white and non-white persons) | Synonyms: interbreeding, miscegenation |
| daybreak | (noun) the first light of day | Synonyms: aurora, break of day, break of the day, cockcrow, dawn, dawning, dayspring, first light, morning, sunrise, sunup |
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| fibre | (noun) a leatherlike material made by compressing layers of paper or cloth | Synonyms: fiber, vulcanized fiber |
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| (noun) the inherent complex of attributes that determines a persons moral and ethical actions and reactions | Synonyms: character, fiber |
| (noun) any of several elongated, threadlike cells (especially a muscle fiber or a nerve fiber) | Synonyms: fiber |
| (noun) coarse, indigestible plant food low in nutrients; its bulk stimulates intestinal peristalsis | Synonyms: fiber, roughage |
| (noun) a slender and greatly elongated substance capable of being spun into yarn | Synonyms: fiber |
| fibreboard | (noun) wallboard composed of wood chips or shavings bonded together with resin and compressed into rigid sheets | Synonyms: fiberboard, particle board |
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| fibreglass | (noun) a covering material made of glass fibers in resins | Synonyms: fiberglass |
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| fibreoptic | (adjective) of or relating to fiber optics | Synonyms: fiber-optic, fiberoptic, fibre-optic |
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| fibreoptics | (noun) the transmission of light signals via glass fibers | Synonyms: fiber optics, fiberoptics, fibre optics |
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| fingerbreadth | (noun) the length of breadth of a finger used as a linear measure | Synonyms: digit, finger's breadth, finger |
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| firebreak | (noun) a narrow field that has been cleared to check the spread of a prairie fire or forest fire | Synonyms: fireguard |
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| flatbread | (noun) any of various breads made from usually unleavened dough | - |
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| gambrel | (noun) a gable roof with two slopes on each side and the lower slope being steeper | Synonyms: gambrel roof |
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| gaolbreak | (noun) an escape from jail | Synonyms: break, breakout, jailbreak, prison-breaking, prisonbreak |
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| gingerbread | (noun) cake flavored with ginger | - |
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| glabrescent | (adjective) lacking hair or a similar growth or tending to become hairless | - |
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| groundbreaker | (noun) someone who helps to open up a new line of research or technology or art | Synonyms: innovator, pioneer, trailblazer |
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| groundbreaking | (adjective) being or producing something like nothing done or experienced or created before | Synonyms: innovational, innovative |
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| (noun) the ceremonial breaking of the ground to formally begin a construction project | Synonyms: groundbreaking ceremony |
| hairsbreadth | (noun) a very small distance or space | Synonyms: hair's-breadth, hair, whisker |
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| handbreadth | (noun) any unit of length based on the breadth of the human hand | Synonyms: handsbreadth |
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| handsbreadth | (noun) any unit of length based on the breadth of the human hand | Synonyms: handbreadth |
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| heartbreak | (noun) intense sorrow caused by loss of a loved one (especially by death) | Synonyms: brokenheartedness, grief, heartache |
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| heartbreaker | (noun) a narrow defeat or a defeat at the last minute | - |
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| (noun) a charming person who is irresponsible in emotional relationships | - |
| heartbreaking | (adjective) causing or marked by grief or anguish | Synonyms: grievous, heartrending |
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| hombre | (noun) an informal term for a youth or man | Synonyms: bozo, cat, guy, sod |
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| homebrew | (noun) an alcoholic beverage (especially beer) made at home | Synonyms: home brew |
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| housebreak | (verb) train (a pet) to live cleanly in a house | Synonyms: house-train |
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| housebreaker | (noun) a burglar who unlawfully breaks into and enters another person's house | Synonyms: cat burglar |
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| (noun) a wrecker of houses | Synonyms: housewrecker |
| housebreaking | (noun) trespassing for an unlawful purpose; illegal entrance into premises with criminal intent | Synonyms: break-in, breaking and entering |
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| icebreaker | (noun) a beginning that relaxes a tense or formal atmosphere | - |
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| (noun) a ship with a reinforced bow to break up ice and keep channels open for navigation | Synonyms: iceboat |
| inbred | (adjective) produced by inbreeding | - |
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| (adjective) normally existing at birth | Synonyms: connatural, inborn |
| inbreeding | (noun) the act of mating closely related individuals | - |
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| interbred | (adjective) bred of closely related parents | - |
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| interbreed | (verb) breed animals or plants using parents of different races and varieties | Synonyms: cross, crossbreed, hybridise, hybridize |
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| interbreeding | (noun) (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids | Synonyms: cross, crossbreeding, crossing, hybridisation, hybridization, hybridizing |
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| (noun) reproduction by parents of different races (especially by white and non-white persons) | Synonyms: crossbreeding, miscegenation |
| jailbreak | (noun) an escape from jail | Synonyms: break, breakout, gaolbreak, prison-breaking, prisonbreak |
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| (noun) the removal of security locks from an electronic device | - |
| jawbreaker | (noun) a word that is hard to pronounce | - |
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| (noun) a large round hard candy | - |
| lambrequin | (noun) short and decorative hanging for a shelf edge or top of a window casing | - |
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| (noun) a scarf that covers a knight's helmet | - |
| lawbreaker | (noun) someone who violates the law | Synonyms: law offender, violator |
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| librettist | (noun) author of words to be set to music in an opera or operetta | - |
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| libretto | (noun) the words of an opera or musical play | - |
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| lowbred | (adjective) (of persons) lacking in refinement or grace | Synonyms: bounderish, ill-bred, rude, underbred, yokelish |
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| macabre | (adjective) shockingly repellent; inspiring horror | Synonyms: ghastly, grim, grisly, gruesome, sick |
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| microbrewery | (noun) a small brewery; consumption of the product is mainly elsewhere | - |
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| middlebreaker | (noun) moldboard plow with a double moldboard designed to move dirt to either side of a central furrow | Synonyms: lister, lister plough, lister plow, middle buster |
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| mouthbreeder | (noun) any of various fishes that carry their eggs and their young in their mouths | - |
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| newsbreak | (noun) a short news announcement concerning some on-going news story | Synonyms: flash, news bulletin, newsflash |
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| outbreak | (noun) a sudden violent spontaneous occurrence (usually of some undesirable condition) | Synonyms: eruption, irruption |
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| outbred | (adjective) bred of parents not closely related; having parents of different classes or tribes | - |
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| prisonbreak | (noun) an escape from jail | Synonyms: break, breakout, gaolbreak, jailbreak, prison-breaking |
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| purebred | (adjective) bred for many generations from member of a recognized breed or strain | - |
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| (noun) a pedigreed animal of unmixed lineage; used especially of horses | Synonyms: pureblood, thoroughbred |
| redbreast | (noun) small Old World songbird with a reddish breast | Synonyms: Erithacus rubecola, Old World robin, robin, robin redbreast |
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| sabre | (noun) a stout sword with a curved blade and thick back | Synonyms: cavalry sword, saber |
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| (noun) a fencing sword with a v-shaped blade and a slightly curved handle | Synonyms: saber |
| (verb) kill with a saber | Synonyms: saber |
| (verb) cut or injure with a saber | Synonyms: saber |
| safebreaker | (noun) a thief who breaks open safes to steal valuable contents | Synonyms: cracksman, safecracker |
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| semibreve | (noun) a musical note having the longest time value (equal to four beats in common time) | Synonyms: whole note |
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| shortbread | (noun) very rich thick butter cookie | Synonyms: shortbread cookie |
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| sombre | (adjective) lacking brightness or color; dull | Synonyms: drab, sober, somber |
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| (adjective) grave or even gloomy in character | Synonyms: melancholy, somber |
| sombrely | (adverb) in a somber manner | Synonyms: somberly |
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| sombreness | (noun) a manner that is serious and solemn | Synonyms: graveness, gravity, soberness, sobriety, somberness |
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| (noun) a feeling of melancholy apprehension | Synonyms: gloom, gloominess, somberness |
| (noun) a state of partial or total darkness | Synonyms: gloom, somberness |
| sombrero | (noun) a straw hat with a tall crown and broad brim; worn in American southwest and in Mexico | - |
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| soubrette | (noun) a minor female role as a pert flirtatious lady's maid in a comedy | - |
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| (noun) a pert or flirtatious young girl | - |
| sowbread | (noun) common wild European cyclamen with pink flowers | Synonyms: Cyclamen hederifolium, Cyclamen neopolitanum |
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| strikebreaker | (noun) someone who works (or provides workers) during a strike | Synonyms: blackleg, rat, scab |
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| strikebreaking | (noun) confrontational activities intended to break up a strike by workers | - |
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| sweetbread | (noun) edible glands of an animal | Synonyms: sweetbreads |
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| sweetbreads | (noun) edible glands of an animal | Synonyms: sweetbread |
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| thoroughbred | (adjective) having a list of ancestors as proof of being a purebred animal | Synonyms: pedigree, pedigreed, pureblood, pureblooded |
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| (noun) a pedigreed animal of unmixed lineage; used especially of horses | Synonyms: pureblood, purebred |
| (noun) a racehorse belonging to a breed that originated from a cross between Arabian stallions and English mares | - |
| (noun) a well-bred person | - |
| tiebreaker | (noun) overtime play in order to break a tie; e.g. tennis and soccer | - |
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| timbre | (noun) (music) the distinctive property of a complex sound (a voice or noise or musical sound) | Synonyms: quality, timber, tone |
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| timbrel | (noun) small hand drum similar to a tambourine; formerly carried by itinerant jugglers | - |
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| tumbrel | (noun) a farm dumpcart for carrying dung; carts of this type were used to carry prisoners to the guillotine during the French Revolution | Synonyms: tumbril |
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| umbrella | (adjective) covering or applying simultaneously to a number of similar items or elements or groups | - |
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| (noun) a formation of military planes maintained over ground operations or targets | - |
| (noun) having the function of uniting a group of similar things | - |
| (noun) a lightweight handheld collapsible canopy | - |
| umbrellalike | (adjective) resembling an umbrella | - |
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| umbrellawort | (noun) a plant of the genus Mirabilis | - |
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| unbreakable | (adjective) impossible to break especially under ordinary usage | - |
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| unbreakableness | (noun) a consistency of something that does not break under pressure | - |
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| underbred | (adjective) of inferior or mixed breed | - |
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| (adjective) (of persons) lacking in refinement or grace | Synonyms: bounderish, ill-bred, lowbred, rude, yokelish |
| windbreak | (noun) hedge or fence of trees designed to lessen the force of the wind and reduce erosion | Synonyms: shelterbelt |
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| windbreaker | (noun) a kind of heavy jacket | Synonyms: anorak, parka, windcheater |
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