亜科[aka] subfamily
医科[ika] medical science
医科大学[ikadaigaku] medical school
家庭科[kateika] home economics
科名[kamei] family name

科する[kasuru] to inflict
科学[kagaku] science
科学院[kagakuin] science institute
科学技術[kagakugijutsu] science and technology

雁の使い[karinotsukai] (a) letter
雁の文[karinofumi] (a) letter
雁の便り[karinotayori] (a) letter
雁行[gankou] the flight formation of geese
雁骨[kariganebone] scapula

雁字搦みに[ganjigaramini] (bind) firmly
雁首[karikubi] (something resembling a) goose's neck
雁首[gankubi] head of a pipe, incl. the bowl and stem attachment
雁書[gansho] letter
雁爪[ganzume] Japanese rake

家鴨[ahiru] domestic duck
鴨嘴[kamonohashi] platypus (Ornithorhynchus anatinus)
鴨居[kamoi] lintel
鴨打ち[kamouchi] duck hunting
鴨猟[kamoryou] duck hunting

鴨脚樹[ichou] ginkgo (Ginkgo biloba)
真鴨[magamo] mallard (Anas platyrhynchos)
間鴨[aigamo] cross between a mallard and domestic duck
小鴨[kogamo] green-winged teal (species of duck, Anas crecca)